Falls du interesse an dem No-ip zeugs hast was auch schon strike angeschnitten hat hier ein kleine howto auf englisch:
How to create a no-ip address
1) firstly go on
[Only registered and activated users can see links. Click Here To Register...] create an account there and log on with it
2) Then on the left under hosts/redirectors click on Add
3) It will then take you to a page where you create your ip
4) Where it says "hostname", you type in the name you wish to use, then for the box underneath it just choose any address you want i just left it as no-ip.info. in "Host type" select "Dns Host (A). in the "IP address" box you type in your ip address (if you look up at the top left you will see your "current ip", use that ip in the box. Then in "Assign to group" leave it blank. In "Allow wildcards" leave it unchecked. Then in "MX Record" leave all the boxes blank, but in "MX Priority" make sure you have these numbers going downwards:
5
10
15
20
25
then clcik on create host and voila
Note: Remember that everytime you disconnect from ur internet and reconnect you will have to modify your no-ip to the new IP address you get.
To do this you simply click on manage, next to ur no-ip address click on modify, then change the ip address in the "ip address" box into your new IP.
Ist aber nicht unbedingt notwendig einfach nur komfortabler wenn ihr häufiger zusammen spielen wollt.
LG seth