Ooh...thanks bitt. Actually I saw some of the gratuituous ARP packets today in ethereal and wondered what they were, but I've spent so much time reading RFC's my mind is going round the bend!

Actually, so much so that I couldn't figure out why I wasn't seeing a response to the DHCP discover packet I was sending, spent most of the afternoon trying to find out why.....

...only to finally remember that the network in my office is plugged into a switch not a hub, so I wouldn't see the response to the discover packet on ethereal on my PC! Obviously when I put a breakpoint on my UDP code the packet was coming back in....d'oh.

Taking in my little 4 port hub tomorrow so I can at least use ethereal to verify my packets and see the traffic flow!