how to avoid net stuffups inside parallels/NetBSD

[George Michaelson <ggm%apnic.net@localhost>]

I run current inside parallels under Leopard (OSX 10.5)

Very repeatably from NetBSD pkgsrc and wip sources, I get this  
diagnostic on the Parallels console:

ne2 discarding oversize frame (len=1528)

I believe it relates to the virtual/bridged ethernet, and I have tried  
to reduce my MTU but
to no avail.

(when it happens, the ftp/cvs stalls. not dies, stalls. I can ^C out  
fine, and I can continue
 to do other things, but for that network source, I cannot fetch the  
data in question, it
 repeatedly does this)

any other suggestions what might stop it happening?

-George