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Sophos UTM: DHCP relay Unknown network segment error

Issue:

User is trying to configure sophos UTM as main DHCP server to his internal subnet. His requirement is to configure another DHCP server in his internal network and sophos UTM should act as DHCP relay to other interfaces connected to UTM.

He added all the required interfaces an DHCP server IP under network services>>DHCP>>relay tab but still he is getting the unknown network segment error.

DHCP relay setting
DHCP relay

Resolution:

Along with all client interfaces, he should also add main DHCP server interface under network services>> DHCP>>relay tab.

Only then DHCP clients will get the IP address from the server.

Hope this article helps you.