Those informations are/may be very outdated, please go to: new wiki
Port Forwarding on Speedport w701VEdit
At first make sure that you are connected with your router, then open a browser and navigate to the ip of your router. As usal now you have to enter a pin to configure your router.
At first you have to have to activate port forwarding, in this example you can find it under "Networking" and there it's called "PPPoE Pass-Through".
Now you have to open the port 61357 for TCP, in this example you have to browse to "NAT & port rules", there you must click on "create new rule". The name of the rule does not matter. You have to enter a public port and a private client port, for both enter 61357.