Networking stopped functioning

[Janne Vänttinen]

I have this little problem with networking.

I have Kubuntu 5.10 with KDE 3.5, connected to Internet through a 
Linksys router. Router has local DHCP enabled so that when Kubuntu was 
installed, it auto-detected the network and everything was fine.

However, I wanted to give my computer a static local address 
192.168.1.10 (not distributed through DHCP). I opened the network setup 
and changed network setup to manual, IP to 192.168.1.10, gateway to 
192.168.1.1 (the router) and checked the box to connect this network 
automatically when computer starts. I checked other tabs, found that 
everything seemed to be in order, and saved my changes. Everything still 
seemed to be fine.

But then I restarted the computer. Now, nothing works. No connection to 
anything, not even localhost (where my firefox default page is). 
Naturally my first instinct was that I made some mistake and I checked 
the settings. Everything was as it was supposed to, but network was 
disabled. I tried to enable it and the enabled-icon flashed briefly but 
then turned disabled again.

I restarted again, still no network. Frustrated, I changed the settings 
back to DHCP, checked everything and saved settings. Nothing. I 
restarted once again. Still nothing. The settings are exactly as they 
were when I started, but nothing works.

Now I'm writing this on my dual-boot WinXP, which works just fine when I 
made the same modifications (well, windows-style anyway). So the router 
should at least be fine.

So, pardon the abbreviation, WTF is wrong with my Linux? Help, anyone...