dhcp server (socket binding)

[EvilEzh]

Can someone explain more about subj.
Let see:
incoming broadcast 0.0.0.0 -> 255.255.255.255 i can get thease packets
incoming broadcast 10.4.0.1->255.255.255.255 i can't get thease packets.

In another words, if there is ip address in source, i can't get thease 
packets to process (mostly thease are request packets to renew lease).
I've binding
ip = 0.0.0.0
interface = eth1
if i bind to ip address ip=xx.xx.xx.xx i can't get any packet to process.

I've set up relay also ... so relay catch thease packets and forward to ip 
address.
ip = 10.2.0.15
interface = eth0