ethernet problem: why gateway doesn't match?

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http://crunchbang.org – The ethernet on this desktop has been problematic.  Itkeeps finding the wrong gateway.  I.e., it sees the router, but not the internet.Right now it is working only because my brother-in-law locked the gateway in the /etc/network/interfaces file.Here's is what he done.root@crunchbang:/home/rscheng# ifconfig eth0 Link encap:Ethernet HWaddr 00:16:ec:8d:e4:47 inet addr: Bcast: Mask: inet6 addr: fe80::216:ecff:fe8d:e447/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1 (HowTos)