[all variants] OpenVPN client + services on same router

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http://ubuntuforums.org – Hello, I am using my linux router successfully since several month now as a OpenVPN client + PPPoE DSL router. All traffic from every client behind the router is directly passed through a OpenVPN connection. But I wanted to have some services run on the router too like SSH and others, and I want them to be accessible from out WAN side, like normal when there wouldn't be any VPN link. How do I do that? Everytime I start the OpenVPN client connection, my router isn't accessible anymore from outside the WAN connection. How do I route specific ports coming in from WAN so the router answer (Hardware)