[cctalk] Sun-1 netboot debugging

We're trying to netboot a Sun-1. Initially, the machine issues the following packets (over and over...): 17:23:16.834126 In 00:00:00:00:00:00 (oui Ethernet) ethertype IPv4 (0x0800), length 90: localhost.52483 > localhost.domain: 9273+ PTR? 255.255.255.255.in-addr.arpa. (46) 17:23:16.834158 In 00:00:00:00:00:00 (oui Ethernet) ethertype IPv4 (0x0800), length 118: localhost > localhost: ICMP localhost udp port domain unreachable, length 82 After a short while (10 seconds?), it gives up (because the ndd server doesn't recognize it), it times out and then generates the following packet: 17:23:26.333093 B 02:60:8c:03:40:50 (oui Unknown) ethertype IPv4 (0x0800), length 64: 0.3.64.80 > 0.0.0.0: nd 28 Where, of course, the ...:40:50 is the MAC address in the source address. Does this ring a bell with anyone? n.b. This seems to pre-date RARP, so any insight would be valuable. T