no internet connection from server

[Tim]

Hi, I am playing around with a box I have set up as a server. The other
day I used DynDNS.org to set up a host. In doing so I have screwed up my
internet connection from the server box. I can still access the server
from my little network. Where do I start looking for the problem? 
ifconfig:

eth0      Link encap:Ethernet  HWaddr 00:50:BA:B8:40:66  
          inet addr:192.168.1.5  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::250:baff:feb8:4066/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:42 errors:0 dropped:0 overruns:0 frame:0
          TX packets:115 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:4977 (4.8 KiB)  TX bytes:15320 (14.9 KiB)
          Interrupt:9 Base address:0x4c00 

What other info is needed to fix this problem?

Tim