> boot: client IP address: 130.115.144.11
> boot: client name: neptune
> Can't open network device ie(0,0,0)'
> open: netbsd: Unknown error: code 72
> device[ie(0,0,0)]:
> 

Error code 72 is listed as BADRPC. This is generally returned on garbled
RPC replies, though I don't dismiss the possibility that the server
actually sent back a more meaningful error code.

>From the trace above you actually got as far as an attempt to mount the
root directory for `neptune'. I suggest you check the export attributes
on the server.

-pk