MX75 SD-WAN DHCP relay setup with VLANS

[carlfitzsimmons]

I am setting up an MX75 with SD-WAN with 3 VLANS

• 1 (192.168.1.0/24)
• 10 (192.168.10.0/24)
• 100 (192.168.100.0/24)

VLAN 100 needs to relay DHCP requests to 192.168.100.10. When I set VLAN 100 to relay DHCP to 192.168.100.10 this fails when you go to save.

This is the error:

There were errors in saving this configuration:

• The DHCP relay IP address 192.168.100.10 cannot be in the subnet that is being relayed.

I have set many L2-L3 devices to relay requests to another DHCP Server in the same subnet.

How can I setup VLAN 100 to send DHCP requests to 192.168.100.10 so I can then set the switchports to access VLAN 100 so those devices can send a request then receive a DHCP address from 192.168.100.9?

[Ryan_Miles]

Just disable DHCP on VLAN 100 on the MX. Clients will broadcast their DHCP request on VLAN 100 and your server at .10 will receive it and reply.