duplex problem on the gnatbox

["Simon Yeo" <syeo_at_cs.stanford_dot_edu>]

Howdy,

My Gnatbox Pro (3.0.1) is having problems autonegotiating with Cisco
Catalyst (5000 series) switch ports.  The Catalyst switch port is configured
for full-duplex but the external interface on the Gnatbox is
auto-negotiating to half-duplex when it boots.  So I'm having some
performance issues here.  Any ideas?

BTW, the ethernet card on the gnatbox is 3Com 3c905B-TX Fast Etherlink XL.

Thanks in advance,
-Simon