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Old 09-29-2006, 02:31 PM   #1
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Registered: Dec 2005
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Cannot connect to home network in xubuntu

I recently installed xubuntu onto my other computer and I can't seem to get it connected to the internet. I'm at school so I'm running off that network into a linksys router. So I turned off the computer and plugged in the cable to from the router into the computer and turned it on. In firefox I get an 'unable to connect to server' error. I currently have the network settings at DHCP and this is what happens when I type 'ifconfig':
eth0 Link encap:Ethernet HWaddr 00:08:A1:11:20:5C
inet6 addr: fe80::208:a1ff:fe11:205c/64 Scope:Link
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:129 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:10 Base address:0x1400

lo Link encap:Local Loopback
inet addr: Mask:
inet6 addr: ::1/128 Scope:Host
RX packets:585 errors:0 dropped:0 overruns:0 frame:0
TX packets:585 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:44252 (43.2 KiB) TX bytes:44252 (43.2 KiB)

I've searched on the forums here and at the ubuntu site but I couldn't find anything that helped me. Any suggestions would be greatly appreciated.
Old 09-29-2006, 03:36 PM   #2
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Distribution: Debian, Ubuntu, LinuxMint, Slackware, SysrescueCD, Raspbian
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It appears your DHCP setup is not working.

You don't have an IP address assigned. Look at your ifconfig output for eth0. There is no "inet addr:" listing. Nor "Bcast:" or "Mask:" Those should be assigned to you via DHCP. The line of ifconfig output that shows this data normally is the second line, between the lines that start with "Link encap:" and "inet6 addr:"

Here's my eth0 listing from home. You can see my IP address there is, shown on the second line of the output:
eth0      Link encap:Ethernet  HWaddr 00:E0:4C:D4:31:D1
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::2e0:4cff:fed4:31d1/64 Scope:Link
          RX packets:544858 errors:0 dropped:0 overruns:0 frame:0
          TX packets:379809 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:536689070 (511.8 MiB)  TX bytes:62887456 (59.9 MiB)
First, I'd determine if you've got something messed up in your router (is is filtering/denying DHCP requests?)

Remove the router and plug your computer directory into the school network. Do you get an IP address assigned under that scenerio?

p.s. - It would be good to make sure your computer is secure and has iptables running and stopping unrequested incoming traffic before plugging directly into the school's network. Alternately, you could just boot with a LiveCD (Ubuntu can boot directly off CD) and run the DHCP testing that way. So you won't expose your harddisk install of Ubuntu to hacking or compromise. Once you figure out how to get an IP assigned in the LiveCD mode, you can go back and get things going in a firewall-protected harddisk-boot mode. Linux is not as likely to be quickly compromised as Windows, but the possibility is still there, so don't do something with a direct network connection before thinking things through.


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