I’ve recently bought RB750GL for use in my workplace as a dhcp server. There are two physical and logical networks where I work. There is a need to change between these networks quite often. Two dhcp servers exist, one for each network. One is handled by Mikrotik, the other one by another machine. It takes a long, long time for desktop clients to obtain IP address from Mikrotik after changing from the network handled by another dhcp device (about 15 seconds).
Mikrotik is connected to a layer 3 switch with several vlans and intervlan routing set up (Mikrotik is also in a VLAN, specifically configured only to it). When I connect Mikrotik router to a layer 2 switch without vlans there is no such a problem. Routes on Mikrotik seem okay as all echo requests are working and addresses are assigned eventually.
I suspect there is a problem with DHCPNAK packets not getting through because desktop clients repeatedly send dhcp packets, with no reply from the router. I am using the latest 6.4 version of the firmware.
I could really use your help, it’s really annoying and possibly deal breaking. Thank you in advance.
first make sure is this problem in MikroTik DHCP or in your network
so configure MikroTik DHCP server and connect your PC directly to MikroTik and check how long it take to receive DHCP IP.
try to solve the problem step by step… I’m using MIKROTIK DHCP and didn’t face the problem…