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NB: This tutorial helps you to setup your router if you have encountered any difficulty to join or create a game.
This documentation is based on the article by Steampowered.com.
These settings also works to make the dedicated server runs.

Router Setup

Setting up a Static IP Address

Your server should use a static IP address. This will allow other computers to reliably find your server when connecting to the router.

The only way to get an external static IP is to pay for one through your internet service provider. A static IP is important if you plan on having your server run all of the time. Using a static IP makes it easy for return players to find your server. Your current external IP address can be found below:

An internal IP address behaves just like an external IP address with the notable exception of only being visible from behind your router. You must use a static IP internally. Your router will forward ports for incoming connections to a specific IP address. If you have your IP setup dynamically, it will not necessarily forward the ports to your server.

Setting Up a Static IP in Windows XP

1. Go to Start > Run and type in: cmd to open a command prompt.
2. Type into the command prompt: ipconfig/all.
   You will see something similar to this:

   Windows IP Configuration
   
   Host Name . . . . . . . . . . . . : MYCOMP
   Primary Dns Suffix . . . . . . . :
   Node Type . . . . . . . . . . . . : Unknown
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   
   Ethernet adapter Local Area Connection:
   
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Realtek RTL8139/810x Family Fast Ethernet NIC
   Physical Address. . . . . . . . . : 00-80-F6-6A-21-E0
   Dhcp Enabled. . . . . . . . . . . : Yes
   IP Address. . . . . . . . . . . . : 192.168.1.100
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : xxx.xxx.xxx.xxx
   xxx.xxx.xxx.xxx
   NetBIOS over Tcpip. . . . . . . . : Disabled

3. Copy down:
   • IP address
   • Subnet mask
   • Default gateway
   • DNS Servers
4. Right-click on My network places and go to Properties.
5. Right-click on Local Area Connection and go to Properties.
6. Select Internet Protocol(TCP/IP) and click on the Properties button.
7. Select the "Use the following IP address" option and fill in the fields with the respective information you copied out of your IPConfig.
8. Click OK and exit the network connection page.

Test your internet connection to ensure that you are still able to access the internet. If not, you probably mistyped one of the fields from the IPconfig. Double-check their values. If you need to get back to the internet immediately, you can do so by going back to your TCP/IP properties and selecting Obtain an IP address automatically.

Setting Up a Static IP in Windows Vista/7

1. Press the Windows Key + R and type in: cmd to open a command prompt.
2. Type into the command prompt: ipconfig/all.
   You will see something similar to this:

   Windows IP Configuration
   
   Host Name . . . . . . . . . . . . : MYCOMP
   Primary Dns Suffix . . . . . . . :
   Node Type . . . . . . . . . . . . : Unknown
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   
   Ethernet adapter Local Area Connection:
   
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Realtek RTL8139/810x Family Fast Ethernet NIC
   Physical Address. . . . . . . . . : 00-80-F6-6A-21-E0
   Dhcp Enabled. . . . . . . . . . . : Yes
   IP Address. . . . . . . . . . . . : 192.168.1.100
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : xxx.xxx.xxx.xxx
   xxx.xxx.xxx.xxx
   NetBIOS over Tcpip. . . . . . . . : Disabled

3. Copy down:
   • IP address
   • Subnet mask
   • Default gateway
   • DNS Servers
4. Click on Start > Control Panel > Network and Sharing Center > Change Adapter Settings.
5. Right-click on Local Area Connection and go to Properties.
6. Select Internet Protocol(TCP/IPv4) and click on the Properties button.
7. Select the "Use the following IP address" option and fill in the fields with the respective information you copied out of your IPConfig.
8. Click OK and exit the network connection page.

Test your internet connection to ensure that you are still able to access the internet. If not, you probably mistyped one of the fields from the IPconfig. Double-check their values. If you need to get back to the internet immediately, you can do so by going back to your TCP/IPv4 properties and selecting Obtain an IP address automatically.

Setting up the Router

Go to your router manufacturer's website and ensure that you are running the most current Firmware available for the router. Check for any known issues with your router or router firmware here.

1. Follow the instructions that came with your router to login to it. Typically, this is done by going to either 192.168.0.1 or 192.168.1.1 and entering a username and password you have either already specified or can be found in your router's manual. The IP address and login information are different for different routers.
2. Go to port range forwarding or the equivalent for your router and open the following ports:

   TCP 27015

   UDP 1200

   UDP 27000 to 27050 inclusive

   TCP 27020 to 27039 inclusive

   Apply the changes and exit the router setup.
   If port 27015 does not work, try another port between 27016-27019 or 27021-27032.

Creating a game

Launch the game and choose create server
choose your options and choose "LAN only" "NO" (if you want to play on Internet). Then it should be ok.