suddenly stopped network
 

Hello,
My network suddenly stopped working. And I really don't understand why.
- I tried a sudo ifconfig eth0 down and up.
- my computer still had a ip-address and dns by dhcp.
- My adsl modem still had an ip-address and dns-anddresses.
- I was able to do a dns lookup on my modem.
- I tried to reboot my modem.
- I stopped my firewall.
But none had any effect.
When I rebooted my system, everything was working again. Isn't this very strange? Does anyone understand what had caused the network fault?
A reboot shouldn't be the only solution. What else could I have done?
Please, some advice.
Kind regards,
Bart Verbeek

Kubuntu 7.10, 2.6.22-14-generic

hi, sometimes modem is responsible for this kind of problems but I think you have changed your configuration of network in modem or PC manually and that cuased the problem, Anyway I use this commands to refresh my whole network:
-sudo /etc/init.d/networking stop|start
-sudo ifconfig eth0 down|up
-sudo ifdown|ifup eth0

in many cases above commands(specially the firest one) will make changes without reboot.

Good Luck.