@simpsonetti It’s hard to give an answer on why this doesn’t work the way you want it if we don’t know how the full setup looks like. You are using shared-network which I have never used before. I have no idea what consequences this might have. Are those two networks (172.16.0.0/16 and 172.18.0.0/16) on the same physical ethernet? Using VLANs as well? You might want to post the full output of ip a s and your complete dhcpd.conf plus information on VLANs so we get the full picture.