712/60 won't boot, strange arp addresses

[Zoltan HERPAI <wigyori@2p.hu>]

hi,

i recently acquired a 712/60 workstation, trying to boot it from lan.
tcpdump looks like this (10.1.1.254 is the bootp server, 10.1.1.253 would
be the IP of the hp box):

03:29:20.253733 0.0.0.0.68 > 255.255.255.255.67:  xid:0xc1f968d1 ether
8:0:9:91:ed:a0 [|bootp]
03:29:20.259366 10.1.1.254.67 > 10.1.1.253.68:  xid:0xc1f968d1
Y:10.1.1.253 S:10.1.1.254 ether 8:0:9:91:ed:a0 sname "ironcurtai"[|bootp]
(DF)
03:29:22.253780 0.0.0.0.68 > 255.255.255.255.67:  xid:0xc1f968d1 secs:2
ether 8:0:9:91:ed:a0 [|bootp]
03:29:22.258825 10.1.1.254.67 > 10.1.1.253.68:  xid:0xc1f968d1 secs:2
Y:10.1.1.253 S:10.1.1.254 ether 8:0:9:91:ed:a0 sname "ironcurtai"[|bootp]
(DF)
03:29:26.253525 0.0.0.0.68 > 255.255.255.255.67:  xid:0xc1f968d1 secs:6
ether 8:0:9:91:ed:a0 [|bootp]
03:29:26.258648 10.1.1.254.67 > 10.1.1.253.68:  xid:0xc1f968d1 secs:6
Y:10.1.1.253 S:10.1.1.254 ether 8:0:9:91:ed:a0 sname "ironcurtai"[|bootp]
(DF)

after this, some strange arp lookups appear in the tcpdump output, like
this:
03:28:48.961476 arp who-has 10.1.1.253 (0:0:0:0:0:70) tell 10.1.1.254
03:28:49.961465 arp who-has 10.1.1.253 (0:0:0:0:0:70) tell 10.1.1.254

the arp address sometimes change, to 0:0:0:0:0:66, or :64. don't know what
this is, bootpd replies to the requests, but they never reach the 712. i
use the rj45 port, which worked when i bought it from a company. any
ideas? i can send the bootptab config on request (hoping the reply will
get to the recipient ;) )

tia,
-w-