> try forcing it to "media 10baseT" via ifconfig?

Done that already with no luck. 

This may be the same problem that Hubert reported in
http://mail-index.netbsd.org/port-sparc64/2002/08/22/0004.html. I haven't
been using NFS, so I haven't seen any SIGSEGVs that might arise from corrupt
text. I have seen the hme <DTIMEXP> and other messages though.

With packet sizes over ~125 bytes I get 50-60% packet loss from ping -f and
with packet sizes ~120 bytes or less I get packet loss of 5-6%. Intermediate
packet sizes result in a packet loss of 30-40%.

Cheers,
Lloyd