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• very slow internet with Linksys WRT54GL only in wireless mode (wired is OK)

  - by gojira

  I bought a new Cisco Linksys WRT54GL router to connect my laptop (running Windows 7) to the internet. I installed Tomato 1.28 firmware on the router. When I connect the laptop to the router via ethernet cable, everything is fine and I get extremely fast up- and download speeds. When I connect wirelesssly however, websites load extremely slow - it takes dozens of seconds to load a website! <-- This is my question, how can I fix the wireless speed issue? Gmail for example is unusable this way. I tried speedtest.net, but this always fails in the upload part of the test so I can't even test the bandwidth (could the fact that it fails in the upload part, not the download part, be an indication what the problem is?!). I have isolated the problem a bit, I am convinced it has to do either with the router itself, the router settings, or the settings of the wireless connection in Win 7. Because previously, I was using another router by Buffalo and I had no problems whatsoever. I have tried to reproduce the settings from the Bufallo router as closely as possible on the Linksys router (same channel, same encryption etc). The download speed problem only occurs with the Linksys router, and only in wireless mode! When I exchange the Linksys router with the Buffalo router I have here for testing, the wireless speed is up to normal again. Also, before I had installed the Tomato firmware I had exactly the same problem, so it has nothing to do with the firmware itself. Notes & things I already tried: Changing the channel: does not seem to affect anything, I am also on the same channel (10) which I was previously on when I had a Buffalo router. QoS is off. Ping to the router itself is OK, ~ 1 ms. Some current settings of the linksys router: WAN / Internet Type: DHCP Wirelesss Mode: Access Point B/G Mode: Mixed Broadcast: check Channel: 10 - 2.457 GHz Security: WPA2 Personal Encryption: AES

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• Why are ISP's installing routers on my site when the feed is a form of ethernet already?

  - by Cosmin Prund

  I'm connected to 3 ISP's right now. Two of them already have routers at my site, the third one announced me "they need to install some equipment" when I requested BGP session. I can only assume they need to install a Router, since that connection is now working fine, using the usual /30 net block for the connection, and the "last-mile" solution is not going to change since they only installed it last week and the BGP was in the contract from the beginning. I simply don't understand this: the "feed" is already a form of ethernet. Even those they're using different technologies for the last mile, they're all entering the ISP router using an RJ45 WAN port. I assume the ISP router does something really important that can't be done by the Big Router on the other end of the connection. It must also be something that can hurt them if miss-configured, since they don't trust us (the client) to do the stuff on our router. And I'm not talking cheap throw-away routers here: One of the routers is Cisco 2800. Edit to add network details: I'm connected to 3 ISP's, two over Radio links, one over Fiber Optic. One of the radio links is going to get dropped and the other radio link will be turned into fiber sometime next year. The fiber is 20 Mbit, radio 1 is 40 Mbit and radio 2 is 2 Mbit. I've got a /24 of provider independent address space. I'm not doing out-of-the ordinary stuff with my network, I'm overly connected because my network needs to be "up" all the time.

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• Variable TTL inside a LAN

  - by user140783

  I recently discovered that ping my local router, returns different TTL values??. The ping 3 switch must pass through before reaching the router, there may be the problem? 192.168.1.99 is the IP of my router , a Cisco WRT120N Thank you! Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo=29ms TTL=3 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=117 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=131 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=111 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=240 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=51 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=66 Traceroute G:\Documents and Settings\Administrador>tracert 192.168.1.99 Traza a la dirección maxi2011 [192.168.1.99] sobre un máximo de 30 saltos: 1 <1 ms <1 ms <1 ms maxi2011 [192.168.1.99] Traza completa. G:\Documents and Settings\Administradorping 192.168.1.99 Haciendo ping a 192.168.1.99 con 32 bytes de datos: Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=190 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=117 Respuesta desde 192.168.1.99: bytes=32 tiempo<1m TTL=117 Estadísticas de ping para 192.168.1.99: Paquetes: enviados = 4, recibidos = 4, perdidos = 0 (0% perdidos), Tiempos aproximados de ida y vuelta en milisegundos: Mínimo = 0ms, Máximo = 0ms, Media = 0ms G:\Documents and Settings\Administrador

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• Connect two networks

  - by Meek Barrios

  Connecting two different offices with a wireless link and linux boxes. Hardware: 2 CISCO RV42, 2 Dual Homed Linux Boxes running debian, 2 2Wire and 2 AirMax 5 Configuration is: Office A LAN A (10.1.1.0/24) -> RV42 A (WAN1 - 10.1.1.254) -> 2Wire A (Internet) LINUX A ( ETH0 (LAN) 10.1.1.253, ETH1 (LINK) (10.1.3.3) Wireless Link --- AirMax A <-> AirMax B connected as Wireless Bridge Office B LAN B (10.1.2.0/24) -> RV42 B (WAN1 - 10.1.2.254) -> 2Wire B (Internet) LINUX B ( ETH0 (LAN) 10.1.2.253 -> ETH1 (LINK) (10.1.3.4) Network configuration is: LAN A - Default Gateway 10.1.1.254 RV42 A - Static Route 10.1.3.0/24 on 10.1.1.253 Static Route 10.1.2.0/24 on 10.1.1.253 Default on 192.168.1.1 (WAN1 Internet Access) Linux A - ETH0 10.1.1.253 netmask 255.255.255.0 gw 10.1.1.254 ETH1 10.1.3.3 netmask 255.255.255.0 gw 10.1.3.1 AIRMAX A - 10.1.3.1 netmask 255.255.255.0 gw 10.1.3.1 LAN B - Default Gateway 10.1.2.254 RV42 B - Static Route 10.1.3.0/24 on 10.1.2.253 Static Route 10.1.1.0/24 on 10.1.2.253 Default on 192.168.1.1 (WAN1 Internet Access) Linux B - ETH0 10.1.2.253 netmask 255.255.255.0 gw 10.1.2.254 ETH1 10.1.3.4 netmask 255.255.255.0 gw 10.1.3.2 AIRMAX B - 10.1.3.2 netmask 255.255.255.0 gw 10.1.3.2 Both linux have ip_forward set to 1 and the following on the iptables: iptables -F iptables -X iptables -P FORWARD ACCEPT iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT I can ping from Linux B any ip on 10.1.1.0/24 segment and on linux A any ip on 10.1.2.0/24 segment however I cannot connect to HTTP or FTP on those machines. From LAN A I cannot see any other network. I'm looking for some advice for this configuration or a better solution. Regards

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• Switch Before Firewall / Router - Multiple public IPs

  - by rii

  I currently Have a 10Mbit Full duplex circuit connected to a small unmanaged switch which then connects to a Sonicwall Firewall / Router. I have several public IP addresses (/28) that are assigned to several devices in my setup. Now the problem is the small switch I have was lent to me and needs to be returned, I have replaced this switch with several other switches but for some reason any other switch I use causes the network to become extremely slow. I believe this is a problem with the autonegotiation of theses hubs, so I am thinking of purchasing a small managed switch (cisco 300 series) and making the receiving port on the swith Explicitly 10Mbit Full Duplex and see if this works. My question is, being that this is a managed switch and needs an IP, will I still be able to run my public ips through it? Say the circuit has 70.80.4.1 - 7 will I still be able to assign 70.80.4.2 to my firewall and 70.80.4.3 to my router connected to some other port in the switch? Will I have to assign the switch a public IP address in this range as well for it to "route" to those other devices or does the switch does not care what IPs goes through it while operating as a Layer 2 Switch? Any help would be greatly appreciated. Thanks in advanced!

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• What's the best way to telnet from a remote Windows PC without using RDP?

  - by Rob D.

  Three Networks: 10.1.1.0 - Mine 172.1.1.0 - My Branch Office 172.2.2.0 - My Branch Office's VOIP VLAN. My PC is on 10.1.1.0. I need to telnet into a Cisco router on 172.2.2.0. The 10.1.1.0 network has no routes to 172.2.2.0, but a VPN connects 10.1.1.0 to 172.1.1.0. Traffic on 172.1.1.0 can route to 172.2.2.0. All PCs on 172.1.1.0 are running Windows XP. Without disrupting anyone using those PCs, I want to open a telnet session from one of those PCs to the router on 172.2.2.0. I've tried the following: psexec.exe \\branchpc telnet 172.2.2.1 psexec.exe \\branchpc cmd.exe telnet 172.2.2.1 psexec.exe \\branchpc -c plink -telnet 172.2.2.1 Methods 1 and 2 both failed because telnet.exe is not usable over psexec. Method 3 actually succeeded in creating the connection, but I cannot login because the session registers my carriage return twice. My password is always blank because at the "Username:" prompt I'm effectively typing: Routeruser[ENTER][ENTER] It's probably time to deploy WinRM... Does anyone know of any other alternatives? Does anyone know how I can fix plink.exe so it only receives one carriage return when I use it over psexec?

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• Choosing gateway router/firewall for small datacenter network [closed]

  - by rvs

  I'm choosing a gateway router/firewall for small internal network for medium-sized web service. Currently there are 5 servers in internal network, up to 50 http(s) requests/second, up to 1000 simultaneous connections, uplink is 100 Mbit. So, network is relatively small and not very busy and we don't like to buy some pricey monster like cisco or jupiper for this site. Instead we'd like to buy two affordable devices (one for spare), which can handle our workload now and some time in future (it might be up to 2x more in 1 year). I had some experience with Sonicwall NSA, but it seems to be too complex for this site (we don't need most of its features) and even too pricey when buying two of them. So, after some research I've come up with following options: Netgear Prosecure UTM Series (probably UTM25) Zyxel ZyWall Series (USG100 or USG200) Sonicwall TZ 210 Is this a good idea? All of the above seems to be more office products, not datacenter ones. Or we should stick with Sonicwall NSA? Does anyone have any hands-on experience with this models? Maybe some other advices? Thanks.

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• What Device/System to use as a "router on a stick"

  - by Jeff Leyser

  I need to create several distinct VLANs, and provide a way for traffic to move between them. A "router on a stick" approach seems ideal: Internet | Router with Trunking Capability ("router on a stick") * * Trunk between router and switch * Switch with Trunking Capability | | | | | | | | | | | LAN 2 | LAN 4 | | 10.0.2.0/24 | 10.0.4.0/24 | | | | LAN 1 LAN 3 LAN 5 10.0.1.0/24 10.0.3.0/24 10.0.5.0/24 We have trunk-capable Layer-2 switches. The question is what to use as the router on a stick. My choices seem to be: 1) Use an existing Cisco 5505 ASA firewall. It appears the ASA can do the routing, but it's a 100Mbps device, and so seems sub-optimal at best 2) Buy a router. This seems overkill. 3) Buy a Layer-3 switch. Also seems overkill. 4) Use an existing Linux Box as a router 5) Use a new Linux box as a router' 6) Something I'm not thinking of I think either (4) or (5) is my best option, but I'm not sure how to choose between them. I expect the amount of traffic that has to cross the VLANs to be somewhat small, but bursty. How much load does routing add to a CentOS machine?

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• Faster, secure, protocol/code required for long-distance transfer.

  - by Chopper3

  I've ran into a problem and I'm looking for a new secure protocol/client/server that's faster over a 1Gb/s fibre link - let me tell you the story... I have a pair of redundant, diversely-routed, 1Gb/s links over a distance of around 250 miles or so (not dark fibre but a dedicated point to point link, not a mesh). At the 'client' end I have a HP DL380 G5 (2 x dual-core 2.66Ghz Xeon's, 4GB, Windows 2003EE 32-bit), at the 'server' end I have a HP BL460c G6 (2 x quad-core 2.53Ghz Xeons, 48GB, Oracle Linux 5.3 64-bit). I need to transfer around 500 x 2GB files per week from the client to the server machines per week - but the transfer NEEDS to be secure. Using both iPerf or regular FTP I can get ~80MB/s of transfer pretty consistently, which is great. Using WinSCP or Windows SFTP I can't seem to get more that ~3-4MB/s, at this point the server's CPU is 3% busy while CPU0 of the client goes to ~30% utilised. We've tried editing various TCP window sizes with little success. Both ends are connected to quite low-usage Cisco Cat6509's with Sup720's. I can replace the client machine with a newer machine and/or move it to Linux - but this will take time. Clearly these single-threaded secure Windows clients are introducing too much latency doing their encryption. So a few questions/thoughts; Are there any higher performing secure protocols or client software for Windows that I could try? I'm pretty protocol-gnostic so long as it'll work between Windows and Linux. Should I be using hardware to do the encryption, either in the client or the network parts? If so what would you recommend? I'm not convinced that just swapping the server would be that much faster, the CPU was only at 30% but then again that's higher than I'd have expected given the load - moving to Linux at the client end may be a better idea but would be quite disruptive. Am I missing a trick? Thanks in advance.

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• Win 8.1 Hyper-v Full Screen and VPN problems

  - by tr0users

  I need to connect to my office using Cisco VPN software (RSA). Once connected all my internet traffic goes through the employer's VPN and this prevents me from listening to spotify. As a way around this I created a Win 2012 VM that I run in hyper-v from my Windows 8.1 Client. First I RDP to the VM, then I connect to the VPN. This forces the RDP session between my host laptop and the VM to close. I then open the hyper-v manager and double-click my VM to get a connection back (not great because I don't get the use of copy & paste this way). Previously when I opened my VM this way I would have full screen. I'm using a 1920x1080 monitor. Today when I re-open my connection to the VM it is displayed in a window that uses maybe 75% of the full screen. I have tried the menu option View\Full Screen Mode only centres the screen and apply black borders around the outside. Could anyone please suggest how I may solve the VPN or Full Screen problems? Thanks Rob.

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• Windows 7 'Unidentified Network'

  - by Throdne

  So my internet was working last night before I went to bed and woke up to a computer that is showing unidentified network. I have tried multiple ways of fixing it. > route delete 0.0.0.0 > uninstalling drivers - restart - reinstall from downloaded drivers > ipconfig /release - /renew > static IP > speed & duplex from auto negotiation to 1.0gbps full duplex > and also changed my network address to no value to 1234567890ab (not in that order) nothing seems to work. I have Comcast internet and when I connect the computer to the modem it works perfectly. but when I connect it to my router again, Unidentified network. I know my router isn't faulty, because my macbook pro, server, NAS, iPhones, and iPads are still working. I have also tried moving the port on the router, still same problem. my router is a: Cisco Small Business RVS4000 motherboard: GIGABYTE GA-990FXA-UD3

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• interactive login on perl cgi script- updated question [closed]

  - by raindrop18

  I am new for perl-cgi script. and my objective is to create user/pass interactive script to log and get information from multiple device at once. instead of add the user/pass credential on the script itself. since i am new if some one show me how to write the interactive part of the script. thanks much!!! here is the current code usr/local/bin/perl -wl use CGI ':standard'; use Net::Telnet::Cisco; # ### set the error fields to nulls $selerror = ""; # ### Input from the screen - make sure data was input if (param() and param('Switches') ne "" and (param('Mac') ne "" or param('Interface Description') ne "" or param('VLAN') ne "" )) { # ### Put the input devices into an array. @devices = param('Switches'); # ### format the header data print header(); print start_html(-title=>"ShowSwitches",-BGCOLOR=>'aqua'); print "\n",h1("<CENTER>Show Switches</CENTER>"); print "\n",hr(),"\n"; # ### Go thru the device array. foreach(@devices) { $error_msg = ""; $TAC_login_error = ""; $open_error = ""; $retry_open_error = ""; $prompt_error = ""; $password_error = ""; # ### Take input host and use to send to Telnet $host = $_; $session = Net::Telnet::Cisco->new(Errmode => 'return', Timeout => 30); # ### Connect to the host $session->open(Host =>"$host", Timeout => 15); $open_error = $session->errmsg; # ### Login with TACACS if host can be connected to if ($open_error eq "") { $session->login('USER', 'PASS'); $TAC_login_error = $session->errmsg; # ### Login with TACACS failed - try standard login if ($TAC_login_error ne "") { # ### Connect to host $session->open(Host =>"$host", Timeout => 15); $retry_open_error = $session->errmsg; # ### Wait for password prompt - multiple matches - devices may have different device prompts. if ($retry_open_error eq "") { $session->waitfor(Match => '/Password:.*$/', Match => '/Enter password:.*$/', Timeout => 20); $prompt_error = $session->errmsg; if ($prompt_error eq "") { # ### Input password $session->print('getmeout'); $password_error = $session->errmsg; $session->waitfor('/.*>$/'); $password_error = $session->errmsg; } } } } # ### No errors, then issue "show commands". if ($open_error eq "" and ($TAC_login_error eq "" or $retry_open_error eq "") and $prompt_error eq "" and $password_error eq "") { # ### Show Mac if (param('Mac')) { $cmd = 'sh mac'; @output = $session->cmd("$cmd"); $show_error = ""; $show_error = $session->errmsg; print "\n",h2($host . ' - ' . $cmd); if ($show_error ne "") { $error_msg = 'Error for show mac - ' . $show_error; print b($error_msg),(br); print hr(),"\n"; $error_msg = ''; } else { print pre(@output); print hr(),"\n"; } } # ### Show Interface Description if (param('Interface Description')) { $cmd = 'sh interface description'; @output = $session->cmd("$cmd"); $show_error = ""; $show_error = $session->errmsg; print "\n",h2($host . ' - ' . $cmd); if ($show_error ne "") { $error_msg = 'Error for show mac - ' . $show_error; print b($error_msg),(br); print hr(),"\n"; $error_msg = ''; } else { print pre(@output); print hr(),"\n"; } } # ### Show VLAN if (param('VLAN')) { $cmd = 'sh vlan'; @output = $session->cmd("$cmd"); $show_error = ""; $show_error = $session->errmsg; print "\n",h2($host . ' - ' . $cmd); if ($show_error ne "") { $error_msg = 'Error for show vlan - ' . $show_error; print b($error_msg),(br); print hr(),"\n"; $error_msg = ''; } else { print pre(@output); print hr(),"\n"; } } } elsif ($TAC_login_error ne "" and $password_error ne "") { $error_msg = "Error - $host " . $TAC_login_error . ' - possible incorrect TACACS or standard password parameters on device.'; } elsif ($open_error ne "") { $error_msg = "Error - $host " . $open_error . ' - cannot connect to host - is it down??'; } elsif ($prompt_error ne "") { $error_msg = "Error - $host " . $prompt_error . ' - password prompt not recognized - invalid TACACS (or user) password.'; } elsif ($password_error ne "") { $error_msg = "Error - $host " . $password_error . ' - possible incorrect user/password parameters on device.'; } if ($error_msg ne "" ) { print b($error_msg),(br); print hr(),"\n"; } print hr(),"\n"; print end_html(),"\n"; } } else { # ### No Show command was selected. if (param('Submit') and param('Mac') eq "" and param('Interface Description') eq "" and param('VLAN') eq "" ) { $selerror = 'No Show Displays were selected. Try again please!!'; } elsif # ### No switch was selected. (param('Submit') and param('Switches') eq "") { $selerror = 'No devices were selected. Try again please!!'; } # ### This formats the initial Show Web page. print header(-Pragma=>'no-cache'), start_html(-title=>"Show Displays",-BGCOLOR=>'aqua'), h1("<CENTER>Show Switches</CENTER>"),hr(), start_form(), b("Select Show Commands:"), br(), br(), checkbox(-name=>'Mac'), checkbox(-name=>'Interface Description'), checkbox(-name=>'VLAN'), br(),br(),hr(),br(), b("Select One or More Devices:"), br(), br(), scrolling_list (-name => 'Switches', -default=> "NONE", -values => ['cs6a', 'cs7a', 'cs7b', 'cs8b', 'cs9a', 'c9b', 'csa' ], -multiple => 'true', -size => 7, ), p(submit('Submit'),reset('Reset')), b($selerror), end_form(),hr(), end_html(); } #

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• Creating a Logical network diagram

  - by user273284

  Im a student and I have been assigned the task of creating a logical network diagram for the following scenario There are 2 buildings, the first is the head office and the second is the branch. The data centre is in the head office, it contains domain controller, mail server, file server and a web server. it provides wired and wireless access to the staff. the branch building is new and it does not have a network. The two buildings must be connected using a VPN connection. The branch building will not have any servers but just network devices that will provide the connectivity, the users in the branch building will be connected to the head office over the VPN. I had created a diagram based on this scenario, but my teacher rejected it saying that it does not follow Cisco hierarchical Model and the servers were not placed correctly in the diagram. I just wanted some help in this matter so that I Can create my network diagram correctly. If anyone could upload a picture of how the logical diagram should be for this scenario will be helpful, any other resources would also be great.

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• powershell vs GPO for installation, configuration, maintenance

  - by user52874

  My question is about using powershell scripts to install, configure, update and maintain Windows 7 Pro/Ent workstations in a 2008R2 domain, versus using GPO/ADMX/msi. Here's the situation: Because of a comedy of cumulative corporate bumpfuggery we suddenly found ourselves having to design, configure and deploy a full Windows Server 2008R2 and Windows 7 Pro/Enterprise on very short notice and delivery schedule. Of course, I'm not a windows expert by any means, and we're so understaffed that our buzzword bingo includes 'automate' and 'one-button' and 'it needs to Just Work'. (FWIW, I started with DEC, then on to solaris and cisco, then linux of various flavors with a smattering of BSD nowadays. I use Windows for email and to fill out forms). So we decided to bring in a contractor to do this for us. and they met the deadline. The system is up and mostly usable, and this is good. We would not have been able to do this. But it's the 'mostly' part that is proving to be the PIMA now, and I'm having to learn Microsoft stuff anyway until/if we can get a new contract with these guys for ongoing operations. Here's my question. The contractor used powershell almost exclusively for deployment, configuration and updating. My intensive reading over the last week leads me to think that the generally accepted practices for deployment, configuration and updating microsoft stuff uses elements of GPOs and ADMX templates, along with maybe some third party stuff like PolicyPak. Are there solid reasons that I've not found yet that powershell scripts would be preferred over the GPO methods? I'm going to discuss this with the contractor lead when he gets back from his vacation, and he'll be straight with me (nor do I think they set us up). But I can also see this might be a religious issue, so I would still like some background on this. Thoughts? or weblinks? Thanks!

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• Suggestions for transitioning to new GW/private network

  - by Quinten

  I am replacing a private T1 link with a new firewall device with an ipsec tunnel for a branch office. I am trying to figure out the right way to transition folks at the new site over to the new connection, so that they default to using the much faster tunnel. Existing network: 192.168.254.0/24, gw 192.168.254.253 (Cisco router plugged in to private t1) Test network I have been using with ipsec tunnel: 192.168.1.0/24, gw 192.168.1.1 (pfsense fw plugged in to public internet), also plugged in to same switch as the old network. There are probably ~20-30 network devices in the existing subnet, about 5 with static IPs. The remote endpoint is already the firewall--I can't set up redundant links to the existing subnet. In other words, as soon as I change the tunnel configuration to point to 192.168.254.0/24, all devices in the existing subnet will stop working because they point to the wrong gateway. I'd like some ability to do this slowly--such that I can move over a few clients and verify the stability of the new link before moving critical services or less tolerant users over. What's the right way to do this? Change the netmask on all of the devices to /16, and update gateway to point to the new device? Could this cause any problems? Also, how should I handle DNS? The pfsense box is not aware of my Active Directory environment. But if I change DNS to use the local servers, it will result in a huge slowdown as DNS queries will still be routed over the private t1. I need some help coming up with a plan that's not too disruptive but will really let me thoroughly test the stability of the IPSEC tunnel before I make the final switch. The AD version is 2008R2, as are the servers. Workstations are mostly Windows XP SP3. I have not configured the 192.168.1.0/24 as a site in AD sites and services.

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• Strange network issue (ZIP file fails CRC test over VPN)

  - by Joe Schmoe

  We have a server in the office running Windows Server 2003 Our office is connected to our datacenter via hardware VPN (Linksys RV082 router in the office to CISCO router in the datacenter). There is a job that runs on the server in the office that does following: ZIP certain files from the server using 7Zip, copy ZIP file to a network share in the office and verify ZIP integrity, copy ZIP file to a network share in the data center and verify ZIP integrity. Problem is - verifying ZIP integrity for the file in the data center always fails. However, if I run 7Zip on the server in data center that exposes that share ZIP file verifies just fine, so it is not actually corrupted during copy operation. Additionally, I tried running ZIP on other computers in the office to verify ZIP file on datacenter file share and it verifies OK. I tried plugging server to the same network port where my workstation is connected using different cable (my workstation doesn't exhibit this problem) and ZIP verification still fails. So the problem is local to that specific server. On network adapter properties for the server in question there is no "Advanced" tab where one can usually configure a lot of network settings. Network card driver is up to date (Windows Update doesn't find anything newer and Lenovo website doesn't have any drivers for Windows 2003 for this computer model). Is there any other way to configure network setting via command line? What settings could be relevant to this problem?

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• So No TECH job so far.

  - by Ratman21

  O I found some temp work for the US Census and I have managed to keep the house (so far) but, it looks like I/we are going to have to do a short sale and the temp job will be ending soon.   On top of that it looks like the unemployment fund for me is drying up. I will have about one month left after the Census job is done. I am now down to Appling for work at the KFC.   This is type a work I started with, before I was a tech geek and really I didn’t think I would be doing this kind of work in my later years but, I have a wife and kid. So I got to suck it up and do it.   Oh and here is my new resume…go ahead I know you want to tare it up. I really don’t care any more.   Scott L. Newman 45219 Dutton Way, Callahan, FL32011 H: (904)879-4880 C: (352)356-0945 E: [email protected] Web:  http://beingscottnewman.webs.com/                                                       ______                                                                                 OBJECTIVE To obtain a Network or Technical support position     KEYWORD SUMMARY CompTIA A+, Network+, and Security+ Certified., Network Operation, Technical Support, Client/Vendor Relations, Networking/Administration, Cisco Routers/Switches, Helpdesk, Microsoft Office Suite, Website Design/Dev./Management, Frame Relay, ISDN, Windows NT/98/XP, Visio, Inventory Management, CICS, Programming, COBOL IV, Assembler, RPG   QUALIFICATIONS SUMMARY Twenty years’ experience in computer operations, technical support, and technical writing. Also have two and half years’ experience in internet / intranet operations.   PROFESSIONAL EXPERIENCE October 2009 – Present*   Volunteer Web site and PC technician – Part time       True Faith Christian Fellowship Church – Callahan, FL, Project: Create and maintain web site for Church to give it a worldwide exposure Aug 2008 – September 2009:* Volunteer Church sound and video technician – Part time      Thomas Creek Baptist Church – Callahan, FL   *Note Jobs were for the learning and/or keeping updated on skills, while looking for a tech job and training for new skills.   February 2005 to October 2008: Client Server Dev/Analyst I, Fidelity National Information Services, Jacksonville, FL (FNIS acquired Certegy in 2005 and out of 20 personal, was one of three kept on.) August 2003 to February 2005: Senior NetOps Operator, Certegy, St.Pete, Fl. (August 2003, Certegy terminated contract with EDS and out of 40 personal, was one of six kept on.) Projects: Creation and update of listing and placement for all raised floor equipment at St.Pete site. Listing was made up of, floor plan of the raised floor and equipment racks diagrams showing the placement of all devices using Visio. This was cross-referenced with an inventory excel document showing what dept was responsible for each device. Sole creator of Network operation and Server Operation procedures guide (NetOps Guide).  Expertise: Resolving circuit and/or router issues or assist circuit carrier in resolving issue from the company Network Operation Center (NOC). As well as resolving application problems or assist application support in resolution of it.     July 1999 to August 2003: Senior NetOps Operator,EDS (Certegy Account), St.Pete, FL Same expertise and on going projects as listed above for FNIS/Certegy. (Equifax outsourced the NetOps dept. to EDS in 1999)         January 1991 to July 1999: NetOps/Tandem Operator, Equifax, St.Pete & Tampa, FL Same as all of the above for FNIS/Certegy/EDS except for circuit and router issues   EDUCATION ? New Horizons Computer Learning Center, Jacksonville, Florida - CompTIA A+, Security+, and     Network+ Certified.                        Currently working on CCNA Certification 07/30/10 ? Mott Community College, Flint, Michigan – Associates Degree - Data Processing and General Education ? Currently studying Japanese

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• June is going to be a busy month!

  - by Monica Kumar

  Who says things slow down in summer? Well, maybe for school kids, but certainly not for Oracle's Virtualization team! June is turning out to be one of the busiest months for us. We are going to be participating in a number of industry events. If you happen to be at any of these, please stop by the Oracle booth and our session/s. Let's go through a run down of these events. 1. 13th Annual Call Center Week June 4-8 Ceasar's Palace, Las Vegas  Event website You're now wondering...why are we at this call center show. It's really simple, Oracle's Desktop Virtualization solutions offer the best way for call center to reliably and securely access enterprise apps using a variety of endpoint devices such as an iPad or a Sun Ray Client. Provisioning new employees becomes a breeze. We'll be jointly showcasing our solution with Oracle's CRM team. Come check us out.  2. Gartner Infrastructure & Management, Florida June 5-7 Orlando, FL  Event website Oracle is a Premier sponsor of the Gartner IOM Summit this June 5 – 7, 2012 in Orlando, FL.  Attendees will have the opportunity to meet with Oracle experts in a variety of sessions, including demonstrations during the showcase receptions. 3. Cloud Expo East Check out our website for details of our participation. Stop by at booth 511 to talk to our Cloud, Virtualization and Big Data experts. In addition, we're delivering a number of sessions at Cloud Expo. The one I want to highlight is the following: Session: Borderless Applications in the Cloud with Oracle VM and Oracle Virtual Assembly Builder Abstract: As virtualization adoption progresses beyond server consolidation, this is also transforming how enterprise applications are deployed and managed in an agile environment. The traditional method of business-critical application deployment where administrators have to contend with an array of unrelated tools, custom scripts to deploy and manage applications, OS and VM instances into a fast changing cloud computing environment can no longer scale effectively to achieve response time and desired efficiency. Oracle VM and Oracle Virtual Assembly Builder allow applications, associated components, deployment metadata, management policies and best practices to be encapsulated into ready-to-run VMs for rapid, repeatable deployment and ease of management. Join us in this Cloud Expo session to see how Oracle VM and Oracle Virtual Assembly Builder allow you to deploy complex multi-tier applications in minutes and enables you to easily onboard existing applications to cloud environments.  Get your free Cloud Expo pass now!  We're offering complimentary VIP Gold Passes. Go to https://www.blueskyz.com/v3/Login.aspx?ClientID=19&EventID=56&sg=177, click “Continue” if you are a New User or log-in if you have already created an account. Once there, you can view the Agenda or Register for Cloud Expo. To register - fill out the basic business card questions and then enter oracleVIPgold in the Priority Code field to change the price from $2,000 to $0. 4. CiscoLive 2012  June 10-14 San Diego, CA Event website Our Oracle VM and Oracle Linux experts will talk about joint collaboration with Cisco on UCS. We'll also highlight customer use cases. 5. Gartner Infrastructure & Operations Management Summit, EMEA Dates: June 11-12 Frankfurt, Germany Event website Meet experts from our Virtualization and Linux team in EMEA. Stop by our booth and find out what's new in Oracle VM Server for x86 and Oracle Linux. June is going to be busy.

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• Hyper-V Live Migration across Sites!

  - by Ryan Roussel

  One of the great sessions I sat in on at Tech Ed this week was stretching a Windows 2008 R2 Hyper-V  Failover Cluster across sites.  With this ability, you could actually implement a Hyper-V cluster where you could migrate or even Live Migrate VMs across sites.   With this area’s propensity for Hurricanes, this will be a very popular topic for me over the next few months. While this technology is possible today, it’s also very complicated and can be very expensive to implement.    First your WAN connection has to support the ability to trunk your VLAN across both sites in order to Live Migrate.  This means you can’t use a Layer 3 routed connection like MPLS.  It has to be a Metro Ethernet connection or "Dark Fiber”.  Dark Fiber is unused Fiber already in the ground that can be leased from  various providers. Both of these connections would allow you to trunk layer 2 across your WAN.  Cisco does have the ability to trunk layer 2 across a routed connection by muxing the traffic but this is only available in their Nexus product line which has a very steep price tag.   If you are stuck with MPLS or the like and Nexus switching is not a realistic possibility, you will have to implement a multi-subnet cluster in which case Live Migration won’t be possible.  However you can still failover VMs to the remote site with some planning and manual intervention.  The consideration here is that the VMs will be on a different subnet once migrated, so you will have to change the IP addressing of your VMs.  This also has ramifications with DNS and Name resolution to control your down time.  DHCP with Reservations for your VMs is the preferred method to achieve the IP changes as this will automate that part of the process.   Secondly, you will have to have  a mechanism to replicate your storage across both sites.  Many SAN vendors natively support hardware based synchronous and asynchronous replication.  Some even support cluster shared volumes which were introduced in 2008 R2.   If your SANs do not support this natively, there are alternative file based replication products either software based like Double Take or hardware appliance like EMC.  Be sure to check with your vendor on the support of Disk majority if you’re replicating your quorum disk between SANs.   The last consideration is the ability to maintain quorum for your cluster.  If your replication provider does not support Disk Majority through replication, you will have to explore Node Majority with File Share Witness.  This will affect your design as a 3 node cluster with 1 node at the remote site and FSW at the production site would not have the ability to maintain quorum if the production site was lost. MS best practice for this would be to implement an even node cluster with 2 nodes at  each site and the FSW at a third site.   And there you have it.  While some considerations and research goes into implementing this solution, even a multi-subnet solution would be invaluable to organizations in the implementations of “warm” DR sites.

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• SQLAuthority News – Live Virtual Classroom New Trend in Technology

  - by nupurdave

  This blog post is by Nupur Dave, who is housewife and works from home. Changing times and a super busy lifestyle have rendered most of us powerless when it comes to doing what we love to do. I feel that a man never ceases to learn and his sole aim is to seek knowledge, and keep growing. However, our tight schedules and packed calendars mean that we really have to struggle to take some time out and follow the path towards learning. Like all working professionals with a family to take care of, I hardly found time to pursue my interests. However, it was getting increasingly important for me to upgrade my skills, not only for my personal quest for knowledge but to also substantiate my professional standing. When I came to know about Koenig Live Virtual Classroom from friends, it piqued my interest. I felt like it was the answer to all my concerns. Without wasting a single minute, I contacted Koenig for a demo class. Here are some of the highlights of Koenig LVC which instantly struck a chord in me: Online Training – Koenig offers 1-on-1 Online Training with the instructor at the other end. Doesn’t matter where I am sitting, in my office or at home, I can connect to my trainer from anywhere. Flexible Timings – The most comfortable part is you get to choose the time that suits you best. Economical -  No need to travel a thousand miles, the experts are right here on your computer screen. So no extra cost of travel, lodging and meals. 24X7 Lab Access: This is again a great feature that proved to be very beneficial in gaining a practical understanding of the subject. Powered by a data center, this facility offers students much to look forward to. 300+ Full Time Certified Experts: Be assured that you are learning from the best people in the industry. Customized Courses: Course material and training delivery is completely customized to suit your specific requirements. Official Courseware: The instructor teaches from official courseware of the vendor, depending on which course you have applied for – be it Microsoft, Cisco, Oracle or any other certification. Take Exam from Anywhere: Post completion of your IT training, you can take your certification exam from anywhere. Again, no need to travel a thousand miles to earn certified status. No Pre-Recorded Sessions: For those who still need clarification, it will be a live online classroom with trainers instructing you in real time. So you won’t get any surprises of getting pre-recorded sessions in place of your live instructor. Koenig’s Live Virtual Classroom methodology greatly exceeded my expectations. The instructor was highly skilled and very professional. I had concerns about the quality of AV on the computer screen, and whether I’ll be able to understand each topic in detail. However, the quality of video and sound, and the learning methodology used was impeccable. If you’re also facing time crunch and other commitment issues which are getting in the way of your professional development, LVC is the best solution to learn and grow. To know more about Student Experiences and Feedback of Koenig LVC, you can view their Testimonials. Reference: Nupur Dave (http://blog.sqlauthority.com)Filed under: SQL Authority

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• How often should network traffic/collisions cause SNMP Sets to fail?

  - by A. Levy

  My team has a situation where an SNMP SET will fail once every two weeks or so. Since this set happens automatically, we don't necessarily notice it immediately when it fails, and this can result in an inconsistent configuration and associated wailing and gnashing of teeth. The plan is to fix this by having our software automatically retry the SET when it fails. The problem is, we aren't sure why the failure is happening. My (extremely limited) knowledge of SNMP isn't particularly helpful in diagnosing this problem, so I thought I'd ask StackOverflow for some advice. We think that every so often a spike in network traffic will cause the SET to fail. Since SNMP uses UDP for communication, I would think it would be relatively easy for a command to be drowned out if traffic was high for a short period of time. However, I have no idea how common this is. We have a small network with a single cisco router and there are less than a dozen SNMP controlled devices on that network. In addition to the SNMP traffic, there are some status web pages being loaded from the various devices. In case it makes a difference, I believe we are using the AdventNet SNMP API version 4.0.4 for Java. Does it sound reasonable that there will be some SET commands dropped occasionally, or should we be looking for other causes?

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• Getting Junk characters while trying to print the file contents using Java

  - by user1523797

  I am reading a file's contents and trying to print the contents using java. But it prints junk characters along with the file content. Code: import java.io.*; public class ReadFile { public String readFile(String filePath){ StringBuilder contents = new StringBuilder(); File file = new File(filePath); try{ String lines = null; FileReader fileReader1 = new FileReader(file); BufferedReader buffer = new BufferedReader(fileReader1); while((lines = buffer.readLine())!=null){ contents.append(lines); } buffer.close(); } catch(FileNotFoundException ex){ System.out.println("File not found."); }catch(IOException ex){ System.out.println("Exception ocurred."); } return contents.toString(); } public static void main(String[] args){ ReadFile rf = new ReadFile(); String lines = rf.readFile("C:\\Data\\FaultDn.txt"); System.out.println("Original file contents: " + lines); } } The file contents are: partner.cisco.com:org-root/mac-pool-QA_MAC_Pool_5-Sep-2012_12:00 The output is:  Can you please point me to what I am missing in this code?

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• Some DHCP clients end up with wrong DNS server

  - by Nic Waller

  The scenario: DC running Windows Server 2008 R2 providing DNS + DHCP Cisco 1811 Router as the gateway 30 Windows XP DHCP clients on the LAN The problem: Some workstations are spontaneously switching to an incorrect DNS server. Specifically, ipconfig /all shows that they start using the gateway as a DNS server. This happens about 5-10 times a day to various computers, sometimes more than once per day. The workaround: Repairing the connection on the XP client always fixes the problem, and the correct DNS server address is obtained. We lost our main DNS/DHCP machine a week ago, and had to bring this one online as a spare. We've been having this issue since then. DHCP leases on the old and new servers are configured for "wired" (8 day) duration. There are definitely no other DHCP servers active on the LAN. So far there is no discernible pattern about which clients will show this problem, or when. When I ran DCDIAG /test:DNS it came back clean. Manual inspection of the DNS zone shows that all the records are appearing as expected, with no traces of the previous machine in there. Update Feb 27: Added screenshots. Here is a screenshot of the DHCP scope options on the 2008 R2 server. And here is a screenshot of ipconfig /all running on a healthy host. I don't have any ailing hosts at the moment, but will grab a screencap next time it happens. Update Feb 28: More screenshots. Here's a screenshot of DHCP and DNS traffic from a healthy client when repairing the local area connection. There's definitely only one server responding, but it does seem strange that the negotiation takes place twice. I'll try to get a similar capture from a sick machine this coming week. Update Mar 01: Caught a bad ipconfig. Here's a screenshot of ipconfig /all from a client that had this issue. It says the lease was issued this morning, but it doesn't even have an entry for the secondary DNS I set up yesterday. Both DNS servers were discovered properly when repairing the connection. Update Mar 01: It even got the sysadmin! This issue finally affected my personal workstation this morning. Unfortunately I had just rebooted and wasn't running a packet dump at the time. I set up a secondary server yesterday, and was logging all DNS traffic to it. My machine had not contacted the secondary DNS in over half an hour, so that says to me that it's just spontaneously reverting to the gateway without even failing over to secondary DNS first. Today I swapped the order of the DNS servers in DHCP, so the secondary is primary and vice versa. I will update again once I know how that goes.

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• How to grow to be global sysadmin of an organization?

  - by user64729

  Bit of a non-technical question but I have seen questions of the career development type on here before so hopefully it is fine. I work for a fast growing but still small organization (~65 employees). I have been their external sysadmin for a while now, looking after hosted Linux servers and infrastructure. In the past 12 months I have been transforming into the internal sysadmin for our office too. I'm currently studying Cisco CCNA to cover the demands of being an internal sysadmin and looking after the office LAN, routers, switches and VPNs. Now they want me to look after the global sysadmin function of the organization as a whole. The organization has 3 offices in total, 2 in the UK and 1 in the US. I work in one of the UK offices. The other offices are primarily Windows desktops with AD domain shops. My office is primarily a Linux shop with a file-server and NFS/NIS (no AD domain for the Windows desktops yet but it's in the works). Each other office has a sysadmin which in theory I am supposed to supervise but in reality each is independent. I have a very competent junior sysadmin working with me who shares the day-to-day tasks and does some of the longer term projects with my supervision. My boss has asked me how to grow from being the external sysadmin to the global sysadmin. I am to ponder this and then report back to him on how to achieve this. My current thoughts are: Management training or professional development - eg. reading books such as "Influencer" and "7 Habits". Also I feel I should take steps to improving communication skills since a senior person is expected to talk and speak out more often. Learn more about Windows and Active Directory - I'm an LPI-certified guy and have a lot of experience in Linux (Ubuntu or desktop, Debian/Ubuntu as server). Since the other offices are mainly Windows-domains it makes sense to skill-up in that area so I can understand what the other admins are talking about. Talk to previous colleagues who have are are in this role already - to try and get the benefit of their experience. Produce an "IT Roadmap" or similar that maps out where we want the organization to be and when, plotted out over the next couple of years with regards to internal and external infrastructure. I have produced a "Security roadmap" already which does cover some of these things. I guess this can summed up as "thinking more strategically"? I'd appreciate comments from anyone who has been through a similar situation, thanks.

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• Multiple subnets on isc-dhcp-server using ddns with bind9

  - by legioxi

  On my network I have two subnets: 10.100.1.0/24 - Wired/wireless 10.100.7.0/24 - VPN Both subnets are served by isc-dhcp-server running on a Debian VM. This same VM runs bind9 for my DNS. ISC-DHCP-SERVER is configured to use DDNS and update BIND9 with hosts/IPs. Everything runs great until a device drops off the wired/wireless network and pops onto the VPN. When connecting on the VPN, a DHCP lease is handed out on the new subnet but DDNS does not update BIND9. Since the device has A/TXT/PTR records it appears ISC-DHCP-SERVER won't switch them to the new IP. The logs show: Connect to wireless: Nov 6 20:55:13 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': adding an RR at 'demo-iphone.internal.mydomain.com' A Nov 6 20:55:13 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': adding an RR at 'demo-iphone.internal.mydomain.com' TXT Nov 6 20:55:13 core-server dhcpd: DHCPACK on 10.100.1.160 to FF:FF:FF:FF:FF:FF (demo-iphone) via eth0 Nov 6 20:55:13 core-server dhcpd: Added new forward map from demo-iphone.internal.mydomain.com to 10.100.1.160 Nov 6 20:55:13 core-server dhcpd: Added reverse map from 160.49.21.172.in-addr.arpa. to demo-iphone.internal.mydomain.com Switch to VPN: Nov 6 20:56:34 core-server dhcpd: DHCPOFFER on 10.100.7.101 to BB:BB:BB:BB:BB:BB (demo-iphone) via 10.100.7.0 Nov 6 20:56:34 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': update unsuccessful: demo-iphone.internal.mydomain.com: 'name not in use' prerequisite not satisfied (YXDOMAIN) Nov 6 20:56:34 core-server dhcpd: DHCPREQUEST for 10.100.7.101 (10.100.1.2) from BB:BB:BB:BB:BB:BB (demo-iphone) via 10.100.7.0 Nov 6 20:56:34 core-server dhcpd: DHCPACK on 10.100.7.101 to BB:BB:BB:BB:BB:BB (demo-iphone) via 10.100.7.0 Nov 6 20:56:34 core-server named[2417]: client 127.0.0.1#57697: updating zone 'internal.mydomain.com/IN': update unsuccessful: demo-iphone.internal.mydomain.com/TXT: 'RRset exists (value dependent)' prerequisite not satisfied (NXRRSET) Nov 6 20:56:34 core-server dhcpd: Forward map from demo-iphone.internal.mydomain.com to 10.100.7.101 FAILED: Has an address record but no DHCID, not mine. One thing to note is that the MAC of the device when connecting via VPN is the MAC of my Cisco ASA5512X and not the actual device. The ASA is relaying the DHCP request from the VPN client to the VM running ISC-DHCP-SERVER. Is there a way to get DDNS working in this scenario?

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