Forgetting the modem issue, I still get "network unreachable" errors on pinging out to another machine (there are no routing problems, in my opinion; other machines work fine).
eth0: Interrupt posted but not delivered -- IRQ blocked by another device?
I noticed this in the logs:
an 6 12:54:17 localhost kernel: eth0: 3Com 3c575 Boomerang CardBus at 0x100, 00:60:08:b7:89:fa, IRQ 3
even though I excluded IRQ 3 in config.opts. Could this be the issue? Should I try to force I high IRQ?