Stab in the dark: lack of copy support in the network frontend? NetBSD
currently only has flip support and when attempting to get NetBSD
running
as PV guest in XenServer, Citrix said that flip support is deprecated.
Symptoms on XenServer were that not only did the guest not have network
access, it also stopped all other domUs (and meant the XenServer dom0
had
to be powercycled).
Copy support was pulled-up by Manuel about a year ago (see PR/40650):
http://releng.netbsd.org/cgi-bin/req-5.cgi?show=1030