I've tried power cycling everything in every way possible. That
doesn't seem to be the issue.

I know all the cables work because I can take it out of the Linksys
and plug it in to my laptop and viola it works. Perhaps the DHCP lease
is locked to a MAC address for a period of time.

It could be that the Linksys died but it literally was working just
fine with Comcast just hours prior to me testing it at the new
location.

I think I'll try feeding it a dhcp address from a dhcp server running
on a Linux machine and see if that works.

I'll also play with the STP settings.

Thanks for the ideas.

Eric