Netbooting Trouble with 712/100

Hello all:

I'm trying to netboot an HP 712/100 but it's giving me trouble. This netw=
ork is
having no trouble booting sparc64, alpha, and amd64 machines but this HP =
just
won't go.

The typical attempt looks like this on the wire:

23:55:44.355576 0.0.0.0.68 > 255.255.255.255.67: xid:0x500eae02 [|bootp]

23:55:44.363792 192.168.102.1.67 > 192.168.102.8.68: xid:0x500eae02
Y:192.168.102.8 S:192.168.102.1 [|bootp] (DF)

23:55:46.364620 0.0.0.0.68 > 255.255.255.255.67: xid:0x500eae02 secs:2 [|=
bootp]

23:55:46.372827 192.168.102.1.67 > 192.168.102.8.68: xid:0x500eae02 secs:=
2
Y:192.168.102.8 S:192.168.102.1 [|bootp] (DF)

23:55:51.373736 0.0.0.0.68 > 255.255.255.255.67: xid:0x500eae02 secs:7 [|=
bootp]


If I run 'search' on the boot admin menu of the HP, it gives me the IP ad=
dress
of the DHCP server, so I know it's receiving traffic. It just won't "go" =
for
some reason, and I'm not seeing any error or diagnostic messages outside =
of
'boot failed'.

Any ideas or well known gotchas?