On my firewall "gate protect", I have set one network to use DHCP with the subnet 172.25.112.0/24.
After I connect it on my USG pro as WAN and the LAN port goes on the ubnt POE switch there is connect my cloud-key and some APs.
FW x.x.112.1/24 "DHCP-Server"
USG Pro x.x.112.5 as router "x.x.112.1"
Switch POW x.x.112.3
Cloudkex x.x.112.5
AP- x.x.112.6-15
Wificlients <15
I have always error in my network the clients finish in a services zone "169.x.x.x"
USG get 172.25.112.4/24 and as router my FW "172.25.112.1"
On my controller I set a IP range " 172.25.112.1/24
but I'm sure about DHCP options "server, relay, or no"
What I need is my clients on the 112.x network.
Best Answer
I believe you may have a double NAT problem here. Your Firewall is acting as the default gateway to the internet and then you have the USG with a duplicated IP space. This would work if you were doing a "virtual wire" configurations however in this case it is probably complicating your config.
I would recommend one of two options either remove your independent firewall box and just let the the USG as your firewall and router all in one. Or change the IP address/network on your firewall to be something different than is behind your USG.
Additionally, your DHCP requests will be stopped by the USG as it is acting as a layer 3 boundary. If you enable DHCP on your LAN interface you should be good to go.