Running CSS dedicated server help!

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Hey guys. Well I need some help as i've set up a server with mani admin and all that and it works fine but only over lan. Even with sv_lan 0. The reason being that I can't seem to get it to work with my internet ip and instead only works on 192.168.1.50:27016

When I add my external Ip 86.29.1.47 (using whatsmyip.com to find it) into the command line for starting the server it tells me that it can't allocate a port to that ip.

Suggestions?

:EDIT:

Also trying to use cmd via the command:

srcds.exe -console -game cstrike -tickrate 33 -ip 86.29.1.47 -port 27016 -maxplayers 20 +map de_dust2

gives me the same error and yes I was in the directory of srcds where my server files are.

 

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I found out the problem guys. It was because I have my router plugged into the "stupid hub" (aka virgin superhub) and I forgot it meant I had to port forward the "stupid hub" as well. Though I found an option to change it to a modem which wasn't on there before so i just used that. Now it works fine.

As for the tick rate. Well I'm unsure what to set the tick rate as. I have 30Mb virgin media and have an upload speed of 3Mb I think. I don't think that can handle 100 tick.