I have added a Port-Forwarding rule same public and private port. For some reason the router seems to picks random private pseudo ports. When I add the same rule in Open-Ports or make the internal host a DMZ the router behaves itself and always pick the correct private port. Has anyone seen this before? I have emailed DrayTek support but am not holding my breath!

I raised this issue direct with DrayTek here is there response;

<<<DrayTek support wrote>>>
I just got news from the RD that the port redirection function just works for incoming traffic. If you want to setup a fixed pseduo port, you have to use open port or DMZ functions.