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• Benefits to private networks between virtual machines on an ESXi host?

  - by arex1337

  I'm planning this development environment with a few database servers, and originally thought I would have a few private networks. I then thought it might be unnecessary as the ESXi cluster already provides redundancy with 4 NICs (in my case) and should manage the network traffic pretty intelligently, right? Two private networks Zero private networks What are the advantages/disadvantages between the two shown configurations - on an ESXi 4.1 host?

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• Cisco 1841 and routing /29 address

  - by Jonathan

  Could someone please explain in general terms how I'd configure a Cisco 1841 (2x ethernet ports) to route a public /29 address block (6 hosts) to my internal network. I wish to give the Cisco router one public IP and then several of my internal Windows servers will receive the other public IP addresses. Other hosts behind the router will access Internet via NAT. I'm a bit confused as I've only ever setup routers/firewalls that had a single public IP address with NAT and port forwarding to internal servers.

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• kerberos NTLM authentication

  - by rockbala

  Hi, Where can I check in Windows Server 2008 that Kereberos/NTLM is the authentication protocol used after the whole network is set up/installed. There is only 1 domain controller with AD services and is not affiliated with any other domains. Regards, Balaji S

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• How faster is using an internal IP address instead of an external one?

  - by user349603

  I have a mailing list application that sends emails through several dedicated SMTP servers (running Linux Debian 5 and Postfix) in the same network of a hosting company. However, the application is using the servers' external IP addresses in order to connect to them over SMTP, and I was wondering what kind of improvement would be obtained if the application used the internal IP addresses of the servers instead? Thank you in advance for your insight.

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• Are there known policy settings causing unexpectedly terminated RDP sessions to be logged off - Event 551

  - by bernd_k

  http://msdn.microsoft.com/en-us/library/aa383015(VS.85).aspx states When a user's session is unexpectedly terminated by a network or client failure, the user is disconnected but not logged off. But since we got a new system administrator who installed some policy to terminate disconnected sessions after some hours, I never again could reconnect to to an unexpectedly terminated session (usually VPN problem) I found the following link which shows a similat scenario.

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• Virtual Hard Drive not booting - VMWare

  - by Chloraphil

  I have a .vmdk (VMWare hard disk) file that I cannot use as the lone disk in a new virtual machine. If I attach it to an existing virtual machine then it works fine. It has Windows Server 2003 on it. When I attempt to boot the new VM it attempts a network boot. EDIT: VMWare Workstation 6.5 I could not find a PXE option in the settings, and I did look in the VM config file for "PXE" but did not find one.

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• SSL totally stopped working in Windows

  - by Dims

  Apparently, on my notebook, I have suddenly lost any ability to use network connections, involving SSL and/or data encryption, provided my MS: 1) remote desktop connections: Because of an error in data encryption, this session will end 2) browse HTTPS sites: Can't browse HTTPS pages. TLS error 3) communicate over WiFi, while wired is ok Is there any possible one central reason for all of these problems in Windows? Third party applications, like Putty, works fine. Is it possible to reset/repair certificate store or something in Windows?

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• How to configure sendmail to relay through a specific server

  - by ErebusBat

  I have a tiny home server setup behind my cable modem (bresnan communications). I want to be able for this box to send out email (not receive) for notifications and whatnot. What I have already done: I have installed and configured sendmail. I have added mail.bresnan.net as my SMART_HOST directive. What I belive the problem is When I attempt to send an email I get the following in my mail log: Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: from=aburns, size=140, class=0, nrcpts=1, msgid=<[email protected]>, relay=aburns@localhost Dec 22 10:24:17 batcave sm-mta[1531]: oBMHOHWZ001531: from=<[email protected]>, size=397, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: to=<[email protected]>, ctladdr=aburns (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30140, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBMHOHWZ001531 Message accepted for delivery) Dec 22 10:24:18 batcave sm-mta[1517]: oBMH9mVv001357: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:14:30, xdelay=00:00:42, mailer=relay, pri=300339, relay=pmx0.bresnan.net. [69.145.248.1], dsn=4.0.0, stat=Deferred: Connection timed out with pmx0.bresnan.net. You can see where the message is accepted for delivery by my sendmail server, then where it attempts to hand off to bresnan's server and it timesout. This is where my question is. Asstute readers will notice that pmx0.bresnan.net is not what I have my SMART_HOST directive set as. This is the (outside?) MX server for the bresnan.com/net domain. Apparently bresnan has their network configured so that you can not access this server from within their own network and instead must use the mail.bresnan.net server (which I can connect to). The problem is that I don't know how to tell sendmail to use this server and not the domain. What I have tried Setting a hosts entry so that the pmx0 server points to the mail IP address. This doesn't work, which makes sense as sendmail is obviously doing an MX query to find the server which returns the IP so there is never a need to do a 'normal' DNS resolve so the hosts file never gets involved.

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• Ubuntu 9.10 upgraded with Internet connection fail

  - by Neofizz

  I am pretty sure that the latest Ubuntu release does not support my wireless internet card. Everything was working fine in 9.04 and since upgrading my browser will load web pages. I can see and connect to my wep encrypted network. I can ping google.com and lose no packets. I am at the end of my tether, what else can I try? Is it possible to download a driver to re-enable my wireless?

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• bridge traffic limiting via tc

  - by jackhab

  I have a Linux machine running as a bridge simulating various network conditions. I use tc for this. Introducing delays or packet loss is quite simple but I got into trouble trying to configure bandwidth limiting. Can you, please, show me how to limit all the traffic going through my bridge without any special rules and condition, simply limit it to 1Mb/s? Thanks. PS Your favorite link to tc tutorial will be appreciated.

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• Why does pinging a local router return "Destination Host Unreachable"?

  - by Matt H

  I have two tomato routers. One is bridged wirelessly with the other. I have a new server on the network. It's running Ubuntu Server 11.04. They are all connected like this: A - Linux PC B - New Server C - Mac Mini D - Macbook T1 - Tomato 1 T2 - Tomato 2 They are connected like so: A -----+-T1 ==== wireless bridge ==== T2----- ADSL modem | | C & D Connected wirelessly to T2 B -----+ A, C & D do not experience any issues. I have an active SSH session to B from A and it's not experiencing any loss. B, the new server occasionally cannot ping T2 and therefore cannot connect to the internet. However, A can always contact B and B can ping A and B When the network is lost, B can still ping T1, but not T2 yet at the same as B has lost connection to T2, A can still ping T2. Any ideas on what this could be? there is nothing that gives any clues in any of the logs on either router or the linux server. One thing that is interesting is that I set up a ping running between B and T2. T2 has the IP address 192.68.1.1 Here is what I am seeing: From 192.168.1.1 icmp_seq=26 Destination Host Unreachable From 192.168.1.1 icmp_seq=27 Destination Host Unreachable From 192.168.1.1 icmp_seq=28 Destination Host Unreachable From 192.168.1.1 icmp_seq=29 Destination Host Unreachable From 192.168.1.1 icmp_seq=30 Destination Host Unreachable From 192.168.1.1 icmp_seq=31 Destination Host Unreachable From 192.168.1.1 icmp_seq=33 Destination Host Unreachable From 192.168.1.1 icmp_seq=34 Destination Host Unreachable From 192.168.1.1 icmp_seq=35 Destination Host Unreachable 64 bytes from 192.168.1.1: icmp_req=36 ttl=63 time=3.40 ms 64 bytes from 192.168.1.1: icmp_req=37 ttl=63 time=5.70 ms 64 bytes from 192.168.1.1: icmp_req=38 ttl=63 time=2.25 ms 64 bytes from 192.168.1.1: icmp_req=39 ttl=63 time=2.18 ms 64 bytes from 192.168.1.1: icmp_req=40 ttl=63 time=3.12 ms 64 bytes from 192.168.1.1: icmp_req=41 ttl=63 time=2.15 ms 64 bytes from 192.168.1.1: icmp_req=42 ttl=63 time=1.97 ms 64 bytes from 192.168.1.1: icmp_req=43 ttl=63 time= And it cycles to being reachable and not. So I guess you could say the question is, why is the router responding that it cannot be reached?

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• Roaming profile is not loaded when user's password expires and is changed

  - by JCS

  Our password policy makes users change pw every 30 days, when this happens they sometimes find they are logged on with a local profile and none of their settings. This generally only happens when the PC was slow at logging onto the network, but in this case I know it had plenty of time to do so. I can't work out why this is happening, is it related to a slow link?

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• remote desktop computer viewer?

  - by Josh

  I would like to install a quad core computer in my dorm at college and use my much slower laptop to be able to control the quad core just as if I had a quad core laptop (control as in i see the gui, not command line control)! Both are on the same college network, though Im also interested in what would be necessary if the computers were on different networks. What would be the best method fot this? Im looking for non-lag communication.

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• Toggle-able USB hub with more than one input and output?

  - by user74757

  I recently came across this product: http://ppa-usa.com/shared-network-hub-4-port-usb.html The only problem is, this is nearly opposite of what I need. Ideally, I'm looking for a USB hub-like device that can accept at least two devices for input, and toggle those two devices between at least 2 PC's. The hub linked above appears to be only able to accept one device. Does anyone know of such a product?

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• How to control linux workstations- with poloices.

  - by redknight

  I am going to be administering a small network of linux based workstations for a charity institution (not all have the same distro- some are ubuntu and some are fedora). Is there something in Linux that is similar to group policy in windows?. For example I would like to standardize the wallpapers - have only firefox as a browser - default VLC as the media player etc etc. Thank you, any suggestions are very appreciated.

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• Changing 127.0.0.1:81 to Internal Domain Name ?

  - by Tom

  Hi, I was wondering the steps I can take to change the localhost name to a test development domain name like "website.dev" on Win7 x64 ? Currently, when my test website builds its assigned to 127.0.0.1:81 but I want this to instead have a name like "website.dev" that is accessible on my local network ? [and sure any Virtual PCs built on this local PC] I think this is done via the hosts file but I am little unsure how to do this ? Would someone be able to assist ? Thx

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• can't find ip of wifi acess point

  - by Crash893

  I setup an wireless AP (linksys wifi router) to have no dhcp and point to the main router as the default gateway. I also set it up to obtain a ip from the network but when i go to my main router and look for it i don't see any ip's that it could be If i use net stumbler i can see the mac address of the wifi portion of it but Im at a loss how to get into the web console of this router any ideas on how to "find" this router?

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• How can I copy an XP Mode virtual machine from one computer to another?

  - by Investor5555

  Is it possible to copy an XP Mode Virtual PC image from one computer to a completely different computer (not on the network, not related in any way whatsoever)? I tried this, but it only would seem to work on the same computer: http://www.sevenforums.com/tutorials/21904-virtual-xp-machine-copy.html When I copy it to another computer and modify the settings as described above, the cursor just jumps around all over the screen and never starts.

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• How can I determine which switch the Infiniband subnet manager is running on?

  - by ajdecon

  I recently inherited an Infiniband network containing multiple switches, and I know that one of these switches is running the subnet manager. The rest supposedly have that feature turned off, or were never enabled. The trouble is, I have no idea which one it is... I'd like to replace the switch subnet manager with OpenSM running on a couple of my infrastructure servers. Is there any way, short of logging into each switch individually, to determine which switch is running the SM?

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• Configure Apache to use external proxy for internet connection

  - by warpech

  In my application I am using following rewrite rule: RewriteRule ^/ajax(.*) http://api.externalserver.com/$1 [P,QSA,L] You know what it does. Now the problem is that my corporate network requires me to use HTTP proxy for external internet connections. To ilustrate, this doesn't work: curl -v http://api.externalserver.com/login But this works: curl -v -x 11.22.11.22:8585 http://api.externalserver.com/login How can I make Apache use the corporate proxy for external internet requests?

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• Windows 2003 Server Caching

  - by pablomedok

  We're experiencing almost everyday table index corruption on Windows Server 2003. We are running an old application which uses DBF/CDX tables. Everything was fine for ages, but 6 months after we've installed Advantage Database Server (which allows access to some tables to our website) we started to get index corruption problems. And we don't know whom to blame. We've tried to exclude all possible causes of this corruption. Now all users work in terminal mode - so no network problems can cause that, OpLocks also can't be a reason. We changed hardware, network cards, switches, reainstalled Server and even moved to new dedicated server. The only thing we can't exclude is ADS - because it should be working. Is that possible that local read/write caching that causes that problem? E.g. one user or process uses cached data, later another user/process changes it, and later the first user changes it again without knowing about the first change. Is it possible theoretically? Is it possible that this problem is caused by imporper file server or caching settings? Is it possible that normal users use non-cached data and ADS is using cached data? Or vice versa? Is it possible that each terminal user has its own cache? Or maybe the problem is about RAID caching somehow interfering with Windows Server caching? Or maybe there are some special settings for Windows Server for working with DBF tables that are being written simultaneously by several terminal users? Maybe there is a way to turn off caching for some certain files to check it? Sometimes we get index crash twice a day, sometimes everything is fine for 5 days in a row. Today only one user was working in the evening with the database (usually there are 30-50 users are working simultaneously on working hours). So it's almost zero load on server. , Syncronization with website is performed every 5 minutes during work hours and every 15 minutes in the evening and on weekend. We've done file access auditing and it shows that during website syncroniztions ADS server opens the table and index files for ReadEA and WriteEA though it performs only SELECT queries. ADS does UPDATE/INSERT queries but less freqently - not during regular synchronizations, but only when an order is placed by website visitor). Please help me. We are struggling with this problem for almost a year and still can't find any pattern or any clue about this problem. Here is my previous qestion about this issue on DBA: http://dba.stackexchange.com/questions/8646/foxpro-dbf-index-corruption

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• need direction with assigning 2 ip addresses from my isp for gaming and web hosting

  - by user269451

  Hello and thank you for the help in advance. I have a Windows server 2003 that I want to use to host my companies website and a game server for MineCraft. I have a few weblinks bookmarked in regards to setting up the web and game server but no idea what I do with the two static ip's. Do I assign each network adapter the static ip's or do they go on the router? Any help and direction is greatly appreciated.

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• What sites/publications are good for staying current on security and malware trends?

  - by Holocryptic

  In my ever expanding quest for knowledge, I'm at the point where I feel like I need to be more up to date with the current security trends, as well as malware and such that are in the wild. I'd like to be able to say, "I've heard of that and the fix is...." versus, "Oh, yeah, I had that eat up half my network before I contained it...." What sites and publications are good for keeping up with these things?

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• Can't ping Ip over bridge

  - by tmn29a

  I'm unable to ping another host over a bridge I created, I can't see the error -.- It's a remote machine running debian stable with some backports for which I want to set up DHCP on the new Subnet 172.30.xxx.xxx to be used for KVM-Guests. ifconfig : bond0 Link encap:Ethernet HWaddr e4:11:5b:d4:94:30 inet addr:10.54.2.84 Bcast:10.54.2.127 Mask:255.255.255.192 inet6 addr: fe80::e611:5bff:fed4:9430/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:34277 errors:0 dropped:0 overruns:0 frame:0 TX packets:18379 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2638709 (2.5 MiB) TX bytes:2887894 (2.7 MiB) br0 Link encap:Ethernet HWaddr f2:fc:4d:7f:15:f0 inet addr:172.30.254.66 Bcast:172.30.254.127 Mask:255.255.255.192 inet6 addr: fe80::f0fc:4dff:fe7f:15f0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:252 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:10800 (10.5 KiB) Pings : ping -I br0 172.30.xxx.65 PING 172.30.xxx.65 (172.30.xxx.65) from 172.30.xxx.66 br0: 56(84) bytes of data. --- 172.30.xxx.65 ping statistics --- 3 packets transmitted, 0 received, 100% packet loss, time 2017ms ping -I bond0 172.30.254.65 PING 172.30.xxx.65 (172.30.xxx.65) from 10.54.2.84 bond0: 56(84) bytes of data. 64 bytes from 172.30.x.65: icmp_req=1 ttl=64 time=0.599 ms 64 bytes from 172.30.x.65: icmp_req=2 ttl=64 time=0.575 ms 64 bytes from 172.30.x.65: icmp_req=3 ttl=64 time=0.565 ms --- 172.30.x.65 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 1999ms rtt min/avg/max/mdev = 0.565/0.579/0.599/0.031 ms Route : Destination Gateway Genmask Flags Metric Ref Use Iface 172.30.x.64 * 255.255.255.192 U 0 0 0 br0 10.54.x.64 * 255.255.255.192 U 0 0 0 bond0 default 10.54.x.65 0.0.0.0 UG 0 0 0 bond0 default 172.30.x.65 0.0.0.0 UG 0 0 0 br0 The Interface : cat /etc/network/interfaces auto lo br0 iface lo inet loopback # Bonding Interface auto bond0 iface bond0 inet static address 10.54.x.84 netmask 255.255.255.192 network 10.54.x.64 gateway 10.54.x.65 slaves eth0 eth1 bond_mode active-backup bond_miimon 100 bond_downdelay 200 bond_updelay 200 iface br0 inet static bridge_ports bond0 address 172.30.x.66 broadcast 172.30.x.127 netmask 255.255.x.192 gateway 172.30.x.65 bridge_maxwait 0 If you need more info please ask. Thanks for your help !

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• OS X Server not showing in Windows Vista Shared

  - by Mirage

  I have OS X Server installed. I am using Window Vista on a PC. But on my network I can't see the OS X server. But I can see other Mac computers in shared but not OS X server. I am able to ping the IP. What should I do?

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