Internet access problem

[R Page-Jones]

Hello

I have installed Ubantu 9.10 dual boot with XP

I am using a D-link router DSL-G624T with wired connection.

I have no internet problems with XP, but when booted into Ubuntu I 
cannot access the internet.
I have a connection to the router.  (Putting 192.168.1.1 as a URL in 
Firefox brings up the router page.)

I have tried editing the IP4 stettings to "manual". but I cannot 
complete this action because I don't know what to put in to "Search 
domains" box. So "apply" stays greyed out.

Any advice would be greatly appreciated.

Rob