Unfortunately, the version 6.39rc55 DHCP is not working properly. It is a pity that the Mikrotik long already solves this problem.

6.38.3 DHCP is still not working properly. DEBUG Feb 24 10:06:58 192.168.3.1 dhcp,debug,packet VLAN20 received discover with id 1682309120 from 0.0.0.0 Feb 24 10:06:58 192.168.3.1 dhcp,debug,packet secs = 252 Feb 24 10:06:58 192.168.3.1 dhcp,debug,packet ciaddr = 0.0.0.0 Feb 24 10:06:58 192.168.3.1 ...

Are you with the problem solved after 6.39rc20 ??

For me the problem is Solved ROS 6.39rc17
wireless - apply broadcast bit to DHCP requests when using station-pseudobridge mode;
THX

UPDATE
After the restart after a few days the problem returned or version and 6.39rc17 and 6.39rc19 is also flawed.

Maybe it was the conflict STP openwrt a mikrotik ?? RB951G-2HnD ver. 6.38.1 DHCP SERVER 3x port and WiFi AP port access VLAN 20 1x port WAN port access internet connect 1x port via RB260GS port trunk VLAN 10, VLAN 20, VLAN 30 DHCP is working - ethernet port and WiFi RB260GS ver.1.17 1x port via RB95...

Wireshark tested and writes above user COPACETIC. There is another DHCP server in network lan.

I also have the same problem session stops on the DHCP offered. The problem is version 6.38 and higher. Version 6.37.4 is ok.