[wellylug] help - strange LAN problem

[Don Jones]

Use the command mii-tool to check the speed and duplex settings of your cards, use tcpdump or ethereal see the traffic on your interfaces, check the hub/switch/xover is working. Between these three you should be able to work out where the problem lies (assuming there isnt a firewall ruleset getting in the way somewhere and your network settings, mask, default gw etc are all ok and "cat /proc/sys/net/ipv4/ip_forward" returns 1 on the gw). 

In my experience its most often a firewalling issue (duplex mismatches with switches are also common but dont kill the connection totally)

Don Jones
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