I don'y think so because in
http://www.netbsd.org/Ports/sparc/hardware.html we can read :

Network interfaces: 
	10 Mbps Intel 82586 ethernet, on-board (4/100 and 4/200, may
	not be working properly on 4/400) and VME card (ie) 

and I use the same configuration (rarpd, bootparamd, ..., nfsd) for my
SPARCstation 370 (and others) and it is OK.

David.

You wrote (in your message from Monday 4)
 > Are these problems possibly in any way related to the issues I was having with my 4/110 (that I
 > haven't messed with since I managed ta bum an IPC?) They look mighty similar, tho what I finally
 > ended up with was NFS mounting failing...
 > 
 > David Bonnafous wrote:
 > 
 > > ***************************
 > > *************** the 470 log
 > > ***************************
 > >
 > > Sun SPARCsystem 400.
 > > ROM Rev 3.0, 96MB memory installed, Serial #3574.
 > > Ethernet address 8:0:20:9:70:C8, Host ID 24000DF6.
 > >
 > > [...]
 > > root on ie0
 > > nfs_boot: trying RARP (and RPC/bootparam)
 > > ie0: TDR detected a short 0 clocks away
 > > nfs_boot: client_addr=10.0.0.101 (RARP from 10.0.0.1)
 > > ie0: DMA underrun
 > > ie0: DMA underrun
 > > ie0: DMA underrun
 > > ie0: DMA underrun
 > > ie0: DMA underrun
 > > nfs_boot: timeout...
 > > ie0: DMA underrun
 > > nfs_boot: timeout...
 > > ie0: DMA underrun