DHCP Relay not working (Receiving IP from the wrong pool)

[Ariya Amirjalali]

Hey Guys,

I have an issue that I cant find a solution for. I'm implementing VLANs on our network but DHCP is the issue. So for now I have VLAN 32 and 100. Both can talk to each other through the router policy. VLAN 32 receives IPs from (Windows Server 2016) POOL 1, but VLAN 100 does not receive IPs from POOL 2. It receives from POOL 1 and ignores the pool 2. DHCP relay agent is on the switch. The DHCP traffic gets to the DHCP server but it gets it from the wrong pool. And this is driving me crazy since I have been doing everything right.

VLAN 32

172.16.32.1/24

VLAN 100

172.16.100.1/24

Any suggestions???

[Dennis Mink]

does VLAN 100 use the same dhcp server (i.e. is the IP helper address the same on both interfaces).

you could do a packet capture to see what happens on VLAN 100 when a DHCP request is received by the switch and what the DHCP server sends back (use wireshark)

[Richard Burts]

If we had more detail to work with we might be able to provide better suggestions. Would the original poster share the config with us? If we had that perhaps we might identify the problem.

HTH

Rick