I am running a G4 400Mhz with an ethernet card on the motherboard. I am connected to the web using a cable modem and a linksys router. My machine is able to get a tcp/ip number directly from the cable modem using the DHCP mode. However, when I try to do that from the router I keep getting a number that does not change and it is not related to the router tcp/ip number. On the same network I have a clone G3 that works all the time without any problem when using the router. Sometime if I force the rigth tcp/ip number by manual set and then going to the DHCP mode I can get it to work; howevern it is not a repeatable fix. Zapping the PRAM does not do any good. I had this problem since I got the router (several months) sometime it goes away for long periods of time. Once I get the right tcp/ip number I do not have any connection issue. The line is extremely stable. Any comments or ideas?

I'd make sure the router is properly configured. It sounds like something is corrupted in the communication between the router and the G4. Resetting the router and trashing the TCP/IP Preferences file on the G4 are the first two things I'd try. p

Good idea! I rebuilt the desktop several times but never trashed the preferences. It looks like you nailed it down. Thanks. C