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• ubuntu eth0 not reconnecting after cable unplugged

  - by Alex

  I'm running kubuntu 9.10 w/ gnome, I have a static IP defined in /etc/network/interfaces When I unplugged my network cable and rebooted, then reconnected the network cable I was not able to connect. I tried using sudo ifup eth0, and then ifconfig and it seemed as though the IP address had been assigned and I was connected, but I wasn't. I then did ifdown eth0, and again ifup eth0. For some reason I'm not able to access the network. Furthermore, I also attempted to connect via wlan, and was able to connect to the wireless network, but cannot "see" the network. I can't transfer data or access the internet or anything on the network including the router. How do I resolve this? topsy@monolyth:~$ ifconfig eth0 Link encap:Ethernet HWaddr 00:1c:25:1c:df:70 inet addr:192.168.1.145 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::21c:25ff:fe1c:df70/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5720 errors:0 dropped:0 overruns:0 frame:0 TX packets:565 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:378035 (378.0 KB) TX bytes:46832 (46.8 KB) Memory:fe000000-fe020000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:4 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:240 (240.0 B) TX bytes:240 (240.0 B) By access the network I mean the local network as well as the internet. topsy@monolyth:~$ ping 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=9.14 ms 64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.24 ms 64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=1.01 ms 64 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=1.00 ms [snip... all OK, icmp_seq from 5-30, time between 0.981-1.25ms] ^C --- 192.168.1.1 ping statistics --- 30 packets transmitted, 30 received, 0% packet loss, time 29035ms rtt min/avg/max/mdev = 0.971/1.300/9.140/1.458 ms topsy@monolyth:~$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 link-local * 255.255.0.0 U 1000 0 0 eth0 default 192.168.1.1 0.0.0.0 UG 100 0 0 eth0 root@monolyth:~# cat /etc/resolv.conf # Generated by NetworkManager

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• Broadcom BCM5716 Hangs on CentOS 6 Boot

  - by someotherguy

  I have a fresh CentOS 6 installation on a Dell R310 server with a Broadcom BCM5716. The onboard NIC is causing the boot to hang for some reason. Welcome to CentOS Linux Starting udev: udev: starting version 147 Boardcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.0.23b (Feb 01, 2011) bnx2 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 That's it... then it just hangs / freezes. If I disable the NIC via the BIOS settings, CentOS boots fine. I've downloaded and installed the latest driver from Broadcom's website. Any ideas?

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• How can I unregister a service with dns-sd?

  - by Roman

  I am trying to use "dns-sd" command line tool on my Windows 7 machine. I can already do something. For example I can register a service using "dns-sd -R ...". I also can browser (see) registered services using "dns-sd -B ...". What I still miss, is how to unregister a service. At the moment when I type "dns-sd -R ..." the dns-sd does not return me to the command prompt. To return to the command prompt I need to press Ctrl-C. And the service stays registered till I press Ctrl-C. What I want is to run "dns-sd -R ..." in the background regime and then I would like to have a possibility to unregister a service from the command line. One more thing which I do not understand yet is what "to look up a service" means. In my picture it should be sufficient to register a service, to see it and then to unregister it. But apparently I need to look up a service. What does it mean and why I need to do it? ADDED: As it is asked, I clarify. I refer to "dns-sd" command line tool which I use in Windows 7. I think this command is part of Bonjour software for Windows (from Apple). Well, I did not checked if I had this command before I installed Bonjour, but I assume I did not have it. So, my question is about this command.

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• Setting up a proxy for FTP - Windows

  - by RadiantHex

  Hi folks, I have 2 windows machines and a server. 1 is my laptop, the other is a workstation that the IP of which is white-listed on the server. The laptop has a dynamic IP, so the IP cannot be white-listed. I would like to be able to perform FTP transfers from my laptop to the server, while using the workstation as a proxy. Both machines are using Windows 7. Is this possible? Help would be amazing!

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• If fiber runs 1gig fine, are there any concerns when considering upgrading to 10gig transceivers?

  - by Eric

  We had fiber installed (connecting ~10 buildings) around 5 years ago and it has been working great. The initial setup involved Procurve 2848 and 2824 switches w/ 1gig transceivers. However, lately we have been considering upgrading our network both to increase bandwidth and possibly add VOIP. However, a lot of this is assuming that we can just use pop the existing fiber into 10gig XFP transceivers in better switches and call it a day. If the fiber works fine at 1G does that mean it should be fine for 10gig? If not, how can we confirm that our existing fiber trunks will work, preferably in an affordable fashion?

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• Could a HomePlug be used to connect 2 routers?

  - by tigermain

  I have 2 routers that I would like to connect together (they are wireless but dont have an AP mode) could I simply buy a pair of homeplugs and connect them in order for all machines to have complete visibility of each other?! The DHCP will only be enabled on one, so the other will simply be acting as a switch

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• Is it possible to have a wireless in-house NAS with wireless data transfer rates of equivalent to SATA speeds?

  - by techaddict

  Basically I would like to know, if it is possible to set up an NAS in my house to be accessed wirelessly, that can reach equivalent real-life data transfer speeds to USB 3.0 or an internal SATA hard drive. I have been wanting to do this for some time ( a couple of years now). Basically, this is what I want to do: Plug in a number of hard drives in an array, somewhere in my house, to be left plugged in and never have to be monitored. Ideally several terabytes. Whenever I am home, to have my computer and laptop configured to automatically find the NAS, as easy as plugging in an external hard drive - except completely wirelessly. Data transfer needs to be as seamless and quick as having added another internal hard drive in my laptop. Moreover, data should be able to accessed without having to copy it over - I should be able to wirelessly access the NAS and browse files, and open files directly from the NAS. For example, say I wanted to open a video - I should be able to play the video that is located on the NAS, directly from the NAS, completely wirelessly. If I wanted to open a .pdf file, I should be able to open it and read it directly from the NAS, as if it were located on my physical internal hard drive. Cost is important as well. Please tell me what equipment I need for this to be possible. I know you geniuses out there who can tell me if this is possible.

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• Connecting to localhost resolves 127.0.0.1 but connects with external IP [Linux, Debian]

  - by skgsergio

  I'm having a problem with a dedicated server, I don't known if it's the default behavior but this is the problem: If I connect to a service located on the server with localhost the service gets as source IP the external IP. Let me show an example, I use netcat for listening on 127.0.0.1:4444 xxxxxx # nc -vv -l -s 127.0.0.1 -p 4444 listening on [127.0.0.1] 4444 ... Lets check if it's ok: xxxxxx ~ # netstat -atnp | grep 4444 tcp 0 0 127.0.0.1:4444 0.0.0.0:* LISTEN 14038/nc Ok lets connect: xxxxxx ~ # nc -vv 127.0.0.1 4444 localhost [127.0.0.1] 4444 (?) open Return to the tty that have the listening process and I get this: connect to [127.0.0.1] from xxxxxx.net [176.31.xxx.xx] 50354 So that's the problem. I have a server daemon that have to listen on localhost and checks that the ip is 127.0.0.1 when the client connects but for some reason when I connect to localhost it reports the external ip... If I do the same with IPv6 it works as excepted... Detects connection as localhost (::1). Some info that can be useful: "localhost" resolves without problems to 127.0.0.1 xxxxxx ~ # ping -c1 localhost PING localhost (127.0.0.1) 56(84) bytes of data. 64 bytes from localhost (127.0.0.1): icmp_req=1 ttl=64 time=0.086 ms Nothing weird on my hosts file, I think... xxxxxx ~ # grep -v ^# /etc/hosts 127.0.0.1 localhost localhost.localdomain 176.31.xxx.xx xxxxxx.net ns1.xxxxxx.net ::1 ip6-localhost ip6-loopback feo0::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters ff02::3 ip6-allhosts And ifconfig reports all ok... eth0 Link encap:Ethernet HWaddr e0:69:95:d8:30:a1 inet addr:176.31.xxx.xx Bcast:176.31.108.255 Mask:255.255.255.0 inet6 addr: 2001:41d0:8:xxxx::/64 Scope:Global inet6 addr: 2001:41d0:8:xxxx:x:xx:xx:xx/64 Scope:Global inet6 addr: fe80::e269:95ff:fed8:30a1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:16916 errors:0 dropped:0 overruns:0 frame:0 TX packets:16914 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8410679 (8.0 MiB) TX bytes:10539881 (10.0 MiB) Interrupt:28 Base address:0xe000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:5570 errors:0 dropped:0 overruns:0 frame:0 TX packets:5570 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:744490 (727.0 KiB) TX bytes:744490 (727.0 KiB)

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• Win7 Command Prompt drives not available

  - by jmerrill

  I have the opposite problem compared to the author of this question: Hard drive access denied from Windows Explorer (but works from command prompt as Admin) I can see all the drive letters for a particular server in Windows Explorer, and can navigate through them exactly as would be expected. The drive letters are displayed in Explorer in parens to the right of the path info -- finalpathportion (\\server\otherpathportions) (driveletter:) e.g. jmerrill (\\server\users) (H:) But the drive letters are not usable in a "Run as Administrator" command prompt. They have worked in the past, but I have since rebooted. I thought that perhaps I had to start a new command prompt having visited them in Explorer -- but that did not help. "net use" in the command prompt shows Unavailable H: \\server\users\jmerrill Microsoft Windows Network with similar info for the other drives. I can do net use h: /d net use h: \\server\users\jmerrill for each drive, and get the letters to be available in the command prompt. It is perhaps obvious that I don't think that it should be necessary to do that. Does anyone have any ideas?

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• Upgrade AirPort on Macs to support Snow Leopard's Wake on Wireless/WLAN?

  - by wojo

  Snow Leopard now supports Wake on WLAN, but not all hardware supports this. For example, my Octo Mac Pro from early 2008 has an AirPort card, but it does not support this. Nor does my 2007 2.33GHz MacBook Pro. For reference to what is needed, look at http://www.macrumors.com/2009/08/28/a-closer-look-at-snow-leopards-wake-on-demand-feature/ which includes a screenshot of what the System Profiler should show. It's pretty hard to find Apple parts, but is it possible to put newer cards into these machines to have them support Wake on Wireless?

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• How to route certain applications through a VPN and others to use my 'standard' connection in OSX 10.6?

  - by Alfie

  I am currently working abroad and use my company's VPN for FTP and some browsing. This is a relatively slow connection and while it is suitable for those VPN necessities; much of my other internet usage can be done without the VPN at a much higher speed. Is there a way to tell Safari and my FTP software to use the VPN and for all other connections to go directly to the internet. I am currently using OSX's Network Prefs for running my VPN connection. Ta

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• Convert from port numbers to protocol names ?

  - by Berkay

  i'm simply using tshark -r botnet.pcap -T fields -E separator=';' -e ip.src -e tcp.srcport -e ip.dst -e tcp.dstport '(tcp.flags.syn == 1 and tcp.flags.ack == 0)' to see the all initiated "legal TCP" connections. However, i need the destination port number conversion to "http" "netbios" etc. i'm not using -n option, but still i get: 128.3.45.128;62259;208.233.189.150;80 This is what i'm trying to get: 128.3.45.128;62259;208.233.189.150;http or 128.3.45.128;62259;208.233.189.150;80;http is better option for me. any idea from tshark users? or any other tool suggestions?

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• WEP authentication suddenly failing in Ubuntu

  - by kellishaver

  I'm running Ubuntu 9.10 and after a recent reboot, I'm now unable to authenticate to wireless networks using WEP encryption. I can connect fine to open networks (no idea about WPA). When trying to connect via WEP, I'm continually prompted for the network key, which I know I have entered correctly (and should have been/is saved in my keyring anyway). Everything had been working fine until the reboot. No updates had been installed or configuration changes made. Hardware-wise, everything looks fine (http://pastebin.org/113777), and the fact that connecting to an open network works just fine leads me to think this is a software issue. I just don't know where to begin fixing it. Any insights would be greatly appreciated.

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• How do I "telnet into [my] favourite Web server"?

  - by rookie

  I'm reading a book about programming, and I want to check an HTTP response message. The book is instructing me to telnet into your favorite Web server. Then type in a one-line request message for some object that is housed on the server: for example: telnet cis.poly.edu 80 GET /~hello/ HTTP/1.1 Host: cis.poly.edu What am I supposed to do, exactly? What program do I need? Where do I need to type this message?

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• Security for university research lab systems

  - by ank

  Being responsible for security in a university computer science department is no fun at all. And I explain: It is often the case that I get a request for installation of new hw systems or software systems that are really so experimental that I would not dare put them even in the DMZ. If I can avoid it and force an installation in a restricted inside VLAN that is fine but occasionally I get requests that need access to the outside world. And actually it makes sense to have such systems have access to the world for testing purposes. Here is the latest request: A newly developed system that uses SIP is in the final stages of development. This system will enable communication with outside users (that is its purpose and the research proposal), actually hospital patients not so well aware of technology. So it makes sense to open it to the rest of the world. What I am looking for is anyone who has experience with dealing with such highly experimental systems that need wide outside network access. How do you secure the rest of the network and systems from this security nightmare without hindering research? Is placement in the DMZ enough? Any extra precautions? Any other options, methodologies?

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• netsh doesn't provide commands

  - by Petr Marek

  According to Netsh Commands for Wired Local Area Network (LAN) in Windows Server 2008 and Windows Server 2008 R2, netsh should provide commands such as netsh add profile filename="profile.xml" interface="Local Area Connection" but that's an unknown command for my netsh. Even if I enter netsh show /? it shows me only two options: 'show alias' and 'show helper'. Maybe some library/modules or something is missing? I tested with admin permissions in PowerShell.

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• Configure an Azure VM for Dynamic DNS for Cloud Services

  - by Adam

  I am trying to setup an azure VM with proper DNS to allow multiple cloud services to communicate across cloud service boundaries. As I understand it, I need to provide my own DNS server. I do not have any on-premise infrastructure, so I am trying to configure an Azure VM to act as my DNS. This SO question (http://stackoverflow.com/questions/21858926/azure-how-to-connect-one-cloud-service-with-other-in-one-virtual-network) is very similar to my setup. This article (http://msdn.microsoft.com/en-us/library/windowsazure/jj156088.aspx) describes my particular case: Name resolution between virtual machines and role instances located in the same virtual network, but different cloud services Here is what I have done: Created Azure Virtual Network and declared subnets for each of my cloud services. Created an Azure VM (Windows 2012 R2) with DNS enabled RDP to the VM and enabled the DNS role and installed features Added the appropriate NetworkConfiguration xml section to each of my cloud services .csfg files Re-deployed my cloud services I have verified that I setup the virtual network and networkconfiguration properly because my cloud service hosts are able to communicate with each other if I use the internal ips. However, name resolution doesn't appear to be working, and it doesn't appear that my cloud service roles can communicate with my DNS server. How do I configure my VM so that my different cloud services roles register themselves with my DNS server? EDIT: I think I am 1 step closer to getting this to work. The cloud services that I was using are in an old affinity group which is not supported by VMs, so I was unable to add my VM into my virtual network. I created a new VNET in a new affinity group with my VM added into it. However, I still don't know how to configure the azure VM's DNS server so that the cloud services register themselves for name resolution. Also, an added bonus guaranteed to get a +1 would be to explain if it is possible to register a DNS entry for the VIP for an internal endpoint of my cloud services so we can get load balancing. Thanks!

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• How have multiple web servers and IPs on the same physical network

  - by jsigned

  I do web development out of a small office and need to have multiple physical and virtual servers that can be accessed from the internet. I also have a number of devices (computers, laptops, tablets, printers, etc) that need connections as well. I have gotten a subnet of 8 IP's from my ISP and while that is adequate for the web servers its far too small for everything that needs access to the network. My router is an ASUS RT-N16 running DD-WRT. I'm just smart enough about this routing topic to be dangerous, think 2 year old with a magic marker. I would like to keep my internal network NAT'ed on the 192.168.x.x network and route the 68.69.x.x 255.255.255.248 traffic directly to the servers. The physical network consists of the 4 port DD-WRT router and an unmanaged gig switch. I have a fiber connection to the office that works as an Ethernet port. In other words I can plug my laptop directly into it and have access to the internet. There is no login or password and the router is setup to get DHCP from the ISP, and to provide DHCP addresses for the internal network. What I've done so far is google and try different configurations with little success. In the end I decided I didn't even know how to ask the questions needed. My questions are: Is this the best way to configure the network? How do you do it? VLANs? Multiple routers? I've never had to configure a router using anything more than the GUI so if this is command line stuff be gentle.

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• OS X 10.6 won't automatically connect to wireless even though remember network is checked

  - by Hendy

  Upgraded to 10.6 recently. 10.5 would connect to my home network whenever I was home. 10.6 constantly pops up the network selection dialog and asks me what network I want to join. I click my home network and the password is already entered (so it "remembers" the network). "Remember network" is checked... but it does it every time. How do I get 10.6 to connect to networks automatically whenever it sees them?

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• I used route delete 0.0.0.0 in Windows 7 and now i can't connect to my adsl internet

  - by Santiago Sanchez

  I was looking for a way to portfoward 0.0.0.0 default gateways and I found in a Microsoft page that I had to try the command route delete 0.0.0.0, my internet disconnected and I couldn't connect to the internet anymore... Does anyone have a solution? It's an ADSL Modem. I have: Windows 7 x32 4 GB ram A kanji modem that has this problem too... It's like Windows doesn't detect the wireless adapter, so it won't connect to the internet.

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• Correct way to set up office network - 8 workstations, a file server and a staging server

  - by naunu

  Our office had this old school windows 2003 domain setup, our server caught fire, and now we are looking to do it right from scratch. Here is what we need: 5 PC and 3 Mac workstations for web development, they will each have WAMP/MAMP setup on them, managed by their developers. We will have a file server for assets, and a LAMP server with an external IP for staging. Here is what we have to work with: 5 IP addresses, brand new PC file server with windows 2008 SE, D-Link DSS-16+ 16 port switch, belkin 5 port wireless router, cable modem with 4 ports. How I have it set up now (this is a temporary makeshift setup): Cable modem = LAMP server, wireless router Wireless router = Switch = All of the workstations and file server (setup as a workgroup). We have noticed our internet is very slow with us all plugged in to the switch, and the switch plugged in to the router. I am not positive, but I think it is because our router does not have NAT. We are also having problems with the MACs connection to the network drive - it keeps disconnecting. I want this done right, and we have a ~$600 budget to buy anything else we need. Does anybody have any advice for me? Should I set up a domain or workgroup?

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• Where do I learn about IP blocks and subnets? Or is there just a calculator that does it all for me?

  - by cwd

  Amazon's elastic compute tool (among others) requires the ip block format for their command: ec2-authorize websrv -P tcp -p 80 -s 205.192.0.0/16 I may be doing this wrong, but as far as I can tell I need to use the block format even for a single IP address. 1) So, how would I do that for this IP? 71.75.232.132 Several years ago I took a CCNA class, and I remember going over IPs and subnets, masks, broadcast addresses, class a/b/c networks, etc. However a lot seems to have changed since then - for example I don't think you can tell what "class" a network is in just by looking at it anymore - sometimes they could be multiple classes. 2) Anyhow, my second question is where do I go to get a refresher on all these things? 3) Or should I just be using ipcalc or an online calculator to do it all for me - and if so, which one?

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• How can I split 200Mbps of streaming traffic into routers?

  - by Jared

  As the title says, I have 200Mbps of streaming video traffic coming into my command center. How do I split the load between routers? Setup is like this: fiber --- router --- switch --- workstations I'm sorry I haven't dealt with this much traffic before. so please be gentle if you're going to kick me out :) EDITED FOR DETAILS: Okay, this specific project is for our company's IP CCTV system. We have deployed over 100++ cameras all over a building/campus and we have estimated each camera to take about 2Mbps of bandwidth each. Now, they're all connected to a switch and that's entirely fine. But coming into our command center, they have to be on a router since it'll get more than 200++ cameras next year (and I don't want to have too many hosts on one subnet). My plan was to have the 1st hundred on a 172.16.9.x block and the 2nd hundred on a 172.16.10.x block (all /24). The servers I have are currently sized to match (about 5 dual 6-core xeons) and I'd have about 19 workstations all streaming video from the 5 servers. (servers pull video from the cameras). But 200Mbps of constant traffic? How the hell do I even break this up? I need to have 1 gateway, to manage the routes... I honestly think I'm way in over my head.

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• Mac: Execute program when joining a specific wireless network

  - by Jon

  My question is essentially the same as this one, but for OS X 10.6 instead of Windows 7. I would like to run a program whenever I connect to my home wireless network (not the one at work or university). I'm sure there's a program that does this, but unfortunately my google-fu isn't strong today.

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• Best security practice for small networks - wifi, lan,

  - by Grimlockz

  We regularly setup small networks for clients in different locations to allow them to work on different products now the question what should be the best security practice. Currently we have a wifi enabled with WPA2 and most laptops connect to this but some will connect to a cabled switch connecting to the router. We are thinking on what we should do to increase the security on our small networks - We do have have security on the laptops so you can share directly to the other persons drive by a simple Windows user account. Some suggestions are: We get a LAN switch with ACL control and mac filtering for the hard wired connections? We get acl working on the wifi via a good Cisco router? ipSec policies on all machines? IP filtering and fixed IPs? I suppose people are worried that anyone can plug into the switches and get the access to the network . Summary: Maintain a level of decent security that can be replicated easily to every setup that we do for clients

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