I've setup an OS X 10.6.5 machine with all of the user accounts and software that I'd like on all of the clients. I used the SIU on our 10.6.5 OS X Server to create a NetRestore image from that machine. I have configured the NetBoot service on the server to use that image.
I have followed the steps in the book Beginning Mac OS X Snow Leopard Server to get to this point.
When I try to boot the client from the network, I see the connection in the NetBoot service logs:
Dec 1 10:16:12 myserver bootpd33093: server starting
Dec 1 10:16:12 myserver bootpd33093: server name myserver.example.net
Dec 1 10:16:12 myserver bootpd33093: interface en0: ip 172.16.2.218 mask 255.255.255.0
Dec 1 10:16:12 myserver bootpd33093: interface en1: ip 172.16.2.217 mask 255.255.255.0
Dec 1 10:16:12 myserver bootpd33093: bsdpd: re-reading configuration
Dec 1 10:16:12 myserver bootpd33093: bsdpd: shadow file size will be set to 48 megabytes
Dec 1 10:16:12 myserver bootpd33093: bsdpd: age time 00:15:00
Dec 1 10:16:12 myserver bootpd33093: service time 0.000020 seconds
Dec 1 10:16:27 myserver bootpd33093: BSDP DISCOVER en0 1,d4:9a:20:c5:5d:be NetBoot001 arch=i386 sysid=iMac10,1
Dec 1 10:16:27 myserver bootpd33093: replyfile /private/tftpboot/NetBoot/NetBootSP0/Pairing Station NetRestor.nbi/i386/booter
Dec 1 10:16:27 myserver bootpd33093: replying to 0.0.0.0
Dec 1 10:16:27 myserver bootpd33093: BSDP OFFER sent 1,d4:9a:20:c5:5d:be pktsize 370
Dec 1 10:16:27 myserver bootpd33093: service time 0.001017 seconds
Dec 1 10:16:27 myserver bootpd33093: service time 0.000012 seconds
Dec 1 10:16:27 myserver bootpd33093: service time 0.000025 seconds
Dec 1 10:16:27 myserver bootpd33093: service time 0.000012 seconds
Dec 1 10:16:29 myserver bootpd33093: service time 0.000032 seconds
Dec 1 10:16:29 myserver bootpd33093: service time 0.000011 seconds
Dec 1 10:16:40 myserver bootpd33093: service time 0.000026 seconds
Dec 1 10:16:40 myserver bootpd33093: service time 0.000012 seconds
At this point the ServerAdmin interface shows that the client is connected (see image below), but that it's stuck in the NetInstall stage and at 0%. This continues for a couple of hours and then the client connection drops.