Recovering broken system

[Joseph Loo]

On 10/25/2011 11:32 PM, Kevin O'Gorman wrote:
> The problem: I configured my two ethernet interfaces, and they seem to
> be up, but they don't work.  I think it's that the kernel routing table
> has no gateways configured, since
> my attempts to configure routes in  System->Preferences->Network
> Connections do not appear in the results of "route -n".  I'm probably
> doing something really stupid,
> or not doing some simple but required thing, but someone will have to
> tell me what it is.
>
> Help?
> --
> Kevin O'Gorman, PhD
>
>
>

Do /sbin/ifconfig. see if the ethernet connection is configured 
properly. It should have your ip-address shown somewhere. Mine shows up 
like this

/sbin/ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1C:C0:8E:16:52
           inet addr:192.168.21.15  Bcast:192.168.21.255  Mask:255.255.255.0
           inet6 addr: fe80::21c:c0ff:fe8e:1652/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:10576121 errors:0 dropped:0 overruns:0 frame:0
           TX packets:14942795 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:7067333300 (6739.9 Mb)  TX bytes:6104087688 (5821.3 Mb)
           Interrupt:27 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:11520219 errors:0 dropped:0 overruns:0 frame:0
           TX packets:11520219 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:15095242989 (14395.9 Mb)  TX bytes:15095242989 
(14395.9 Mb)

wlan0     Link encap:Ethernet  HWaddr 00:1D:6A:44:DB:83
           inet addr:192.168.20.15  Bcast:192.168.20.255  Mask:255.255.255.0
           inet6 addr: fe80::21d:6aff:fe44:db83/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:11392824 errors:0 dropped:0 overruns:0 frame:0
           TX packets:115191 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:3538175720 (3374.2 Mb)  TX bytes:1371190 (1.3 Mb)
           Interrupt:21

-- 
Joseph Loo
jloo at acm.org