DHCP on WAN with DSL
Got ADSL modem with dynamic IP connected to WAN. WAN is configured as DHCP client. Running m0n0 LiveCD on this system, everything works ok, but in pfsense the WAN cannot get the IP, SN & DG. It only gets the DNS servers. Now if I connet cable modem (dynamic IP too) to WAN, everything works as it should.
i think you have to configure the modem to set it to Bridging mode.
maybe this one will give you the idea