This works on RBEM100-56G
Xircom PCMCIA Ethernet Adapter Issues
CBEM56G sleeps 'til a little nudge thru tcpdump(?!) (Kai Krebber)
Maybe just set promiscuous mode? (David Hinds)
Date: 1999, Dec 10
From: Chris Hanson <firstname.lastname@example.org>
I had the same problem with an RBEM100-56G, which appears to be fixed by the "ifconfig eth0 promisc" workaround. So I think Dave's supposition is right.
to: "This works on RBEM100-56G"