Routes are missing on GW router; in particular route to DHCP server. why? OSPF routes are not being exchanged due to OSPF router id issue (process stuck in Exchange phase). Both routers have same router ID for OSPF process, which is not ok (PT does not show error but it should). you accidentally copy sub-interfaces from GW to FW creating OSPF issue. Remove sub-interfaces from Fw router. save and reboot. OR add manually router id on FW and clear ip ospf process. Then, FW router have no route to
172.16.x.x networks. you must advertise those into ospf process.
of server "itself" is wrong; it should be next hop neighboring router.
Then I think
command is wrong as well. All sub-interfaces must have
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