networking "restart" drops eth0 :(

[Matt Patterson]

When you say you lose eth0 does that mean it is no longer a valid 
interface, or it just doesnt come back up? Try this:

sudo ifconfig -a

If you see eth0 in that list then the interface was simply not brought 
back up, you can do that easily by reenabling the device via the ui 
(which is where I assume you are getting the restart option, i wouldnt 
know because I never use the ui). To bring the device back up:

sudo ifup eth0

or

sudo ifconfig eth0 up

It's times like these that I am glad I had to learn debian networking 
the hard way back in the days of potato.


Matt



David wrote:

>I'm just building a brand new Ubuntu server box. Unfortunately I put in
>the wrong address for the nameserver so I changed it manually (edited
>/etc/resolv.conf and /etc/network/interfaces) and now if I restart
>networking I lose the eth0 connection completely! ie, ifconfig only shows
>loopback.
>
>If I completely reboot the machine, eth0 comes back and works fine until
>the next time I restart networking :(
>
>Can anyone suggest what I'm doing wrong?
>
>David.
>
>  
>