Hello guys,

I have RB2011UiAS, i am using this router board for two dhcp server in two ethernet port for example

Dhcp server1 for ip cameras around 80 cams on ether4 and the ip address is 192.168.20.1

Dhcp server2 for access points nearly 17 APs on ether5 and the ip address is 192.168.30.1

So my devices get ip address from both dhcp servers but my issue is in the dhcp lease i saw all mac address es are 00:00:00:00:00:00 i don't know what is the problem ??

Thanks for your help...

Do all leases show all-zero MAC addresses or just some? Lease list showing such MAC address usually indicates that the lease was offered but the handshake did not finish. Could be that the devices (webcams) only perform first part of handshake (getting lease offer) but not the second part (mutual acknowledgements) ... so webcams do have IP configured but DHCP server doesn't know that for sure.
The other possibility is that there's some ARP mockery going on (e.g. proxy ARP or some such) where DHCP server gets confused due to unexpected ARP replies.