>> After several days of desperation ... > > There is no need for this. Try to see the dhcpd's logs, after you put > the server to log it to the maximum extent for you. Then you can try > tcpdump to watch closely the Polycom's requests, you can see if they > are out of standard crap or if there is a problem there. Try again > with another client computer, see if it can obtain an address - this > way you can check if your dhcp server is correctly configured. > >
That only helps if there's something wrong with the client's request. Possibly more likely, the client doesn't like something about the answer from dhcpd. If you'd like somebody to see if they can spot anything, send tcpdump output from one request and answer using each of dhcpd and isc-dhcp (clearly marked up). tcpdump -n -i $interface -Xvvs1500 port bootpc or bootps
