problem: loosing eth0 interface after reboot

driesel · 07-11-2006, 04:16 AM

Hi,

My Ubuntu 6.06 system is running really great now.

But I have one small problem.
Whenever I reboot my PC, the network interface (eth0 wired network to router) is disconnected (sometimes not).
Doing System => Administration => Networking and then deactivating and activating eth0 again (DHCP) solves the problem.
Personally, I can live with this. But the problem is I'm not the only person using the PC.

I feel the has to be a way to permanently have the network interface up and running properly, but I can't figure out how.

Does anyoneknow what I've misconfigured? Should I use a static local IP instead of DHCP?

Otherwise:

Although I do prefer a more 'clean' solution,
How can I make a script that automatically reactivates the eth0 interface on boot up?

greetings,
driesel

Kindly awaiting your professional response

.

nadroj · 07-11-2006, 09:03 PM

Quote:

Does anyoneknow what I've misconfigured? Should I use a static local IP instead of DHCP?

since you have a router it is probably your DHCP server... youll need to confirm this though.

can you post your /etc/network/interfaces file?

driesel · 07-13-2006, 03:20 AM

Hi,

Originally this was the content of my etc/network/interfaces configuration file:

Code:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp

And the I changed it to this:

Code:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
script grep
map eth0

# The primary network interface
auto eth0
iface eth0 inet dhcp

It seems that the hotplug part made some improvements, since using this configuration kept my eth0 connected ever since.
This may well be false because I'm using this config for only 1 day

.

greetings,
driesel

nadroj · 07-13-2006, 11:24 AM

Quote:

# The primary network interface
auto eth0
iface eth0 inet dhcp

the 'auto eth0' should make the device activated at boot.
im not sure what kind of startup scripts ubuntu/debian uses, so look around. in slackware theyre based in /etc/rc.d/rc.* and i could just add the command 'ifconfig eth0 up' to have it automatically come up at each boot, but i dont think ubuntu uses those same scripts. check it out though.

driesel · 07-13-2006, 12:28 PM

Well,

To begin, the hotplug section that I've put into /etc/network/interfaces really made some difference.
The startup scripts are based in etc/init.d, so I could add a script in there with "ifconfig eth0 up".