TUNNEL NETWORK

[Franklinmutisya]

Hello guys am kind new to OpenVPN ..i have a setup PFSense that i use as my router and Firewall..
I have installed openVPN ..and everything setup...when choosing a tunnel network i used my WAN network , but i have had a challenge coz my DHCP assigned one of my clients the same IP as the server/firewall WAN interface.

i was think, Can i use a different network for the tunnel, and if so how can i achieve this...much appreciated in advance