It is a known bug
PCMCIA Power Management and APM
Network not resuming after system resumes: Xircom & Dell (Jeff Key)
Date: 2000, Aug 03
From: David Hinds <firstname.lastname@example.org>
That driver can't handle suspend and resume. I have tried to fix it
but the initialization code in the tulip driver is so convoluted, I
wasn't ever able to get it to work.
Thanks, but...no hope? by Jeff Key, 2000, Aug 03
There is always hope by David Hinds, 2000, Aug 03
to: "It is a known bug"