[ Selfmade Detailed Guide On Hosting. (Link-Sys) ]
With pictures !
from
Sins Forums
After several tries, I've succeded in hosting an online game. I'm here to write a detailed walkthrough.
*I'm using LinkSys WRT54G wireless router, So the guide is based on this router model, but you Will find this useful even if you're using a different type of router.
1. UPGRADE your firmware to v1.02.2 (newest)
Download address can be obtained easily from google or linksys official website. Remember to change your country.

The download should give u a file named "WRT54Gv8_v8.00.2_fw.bin"
Now go into the router setting menu by typing 192.168.1.1 in your browser
If a password is required and u never set a password before, the default is :
Username: (blank)
Password: admin
Under the interface, go into Administration - Firmware upgrade
Select the bin file u just downloaded and click the upgrade button.
THE UPGRADE PROCESS SHALL NOT BE INTERUPTED

After the upgrade, your wireless internet should suddenly disconnect and a black window with a frame will pop up, after a few moment, your wireless internet will reconnect itself again. (firmware upgrade will not reset your wireless internet password)
Recheck your new firmware version under the "Status" tab.
2. Enabling Upnp + port foward on the router
Enabling Upnp
pretty straight foward, go into administration tab, it's at the bottom

Enabling port foward
First of all , u need to obtain your ip
Start - Run - type in "cmd" and press enter
on the black window command line type in "ipconfig" and hit enter
you'll see something like this:

remember the last 3 digits of the ip address that i circled.
Now go into he router setting window again , "Under Application & Gaming" tab, enter:
Application: (blank) Start: 6112 End: 6112 Protocal: Both IP address: (the number from the last step, in this case 113) Check enabled

Save all the settings and exit the browser.
3. Install Upnp service on your computer
Step 1: Click Start > Control Panel.
Step 2: Double-click Add/Remove Programs.
Step 3: Click Add/Remove Windows Components on the left side.
Step 4: Please wait while the list of Windows Components loads.
Step 5: Scroll down to Networking Services. Select Network Services and click Details.
Step 6: Check Universal Plug and Play and then click OK.
4. Enable Upnp and SSDP service
Step 1: Right-click on My Computer and click Manage.
Step 2: Double-click on Services and Applications.
Step 3: Double-click on Services.
Step 4: In the right pane, locate the service named Universal Plug and Play Device Host. Right-click the service and select Properties.
Step 5: Make sure that the Startup type is set to Automatic.
Step 6: Click Start and then click on OK once the service has finished starting.
Step 7: Locate the service named SSDP Discovery Service, right-click the service, and select Properties.
Step 8: Repeat Steps 5 and 6 for the SSDP Discovery Service.
About the firewall, I got it turned off. So i didn't worry much about it.
--------------------------------------------------------------------------------------------------
Restart your computer and start the game.

Note: Altought the "Message" still pops up when i host, I've never encountered any problem since. I've confirmed with few friends that can host, and it was said the "message" is a bug! whether you can host or not need to be tested.
P.S. wondering if this post could be pinned , for convenience. thanks alot.
*I'm using LinkSys WRT54G wireless router, So the guide is based on this router model, but you Will find this useful even if you're using a different type of router.
1. UPGRADE your firmware to v1.02.2 (newest)
Download address can be obtained easily from google or linksys official website. Remember to change your country.

The download should give u a file named "WRT54Gv8_v8.00.2_fw.bin"
Now go into the router setting menu by typing 192.168.1.1 in your browser
If a password is required and u never set a password before, the default is :
Username: (blank)
Password: admin
Under the interface, go into Administration - Firmware upgrade
Select the bin file u just downloaded and click the upgrade button.
THE UPGRADE PROCESS SHALL NOT BE INTERUPTED

After the upgrade, your wireless internet should suddenly disconnect and a black window with a frame will pop up, after a few moment, your wireless internet will reconnect itself again. (firmware upgrade will not reset your wireless internet password)
Recheck your new firmware version under the "Status" tab.
2. Enabling Upnp + port foward on the router
Enabling Upnp
pretty straight foward, go into administration tab, it's at the bottom

Enabling port foward
First of all , u need to obtain your ip
Start - Run - type in "cmd" and press enter
on the black window command line type in "ipconfig" and hit enter
you'll see something like this:

remember the last 3 digits of the ip address that i circled.
Now go into he router setting window again , "Under Application & Gaming" tab, enter:
Application: (blank) Start: 6112 End: 6112 Protocal: Both IP address: (the number from the last step, in this case 113) Check enabled

Save all the settings and exit the browser.
3. Install Upnp service on your computer
Step 1: Click Start > Control Panel.
Step 2: Double-click Add/Remove Programs.
Step 3: Click Add/Remove Windows Components on the left side.
Step 4: Please wait while the list of Windows Components loads.
Step 5: Scroll down to Networking Services. Select Network Services and click Details.
Step 6: Check Universal Plug and Play and then click OK.
4. Enable Upnp and SSDP service
Step 1: Right-click on My Computer and click Manage.
Step 2: Double-click on Services and Applications.
Step 3: Double-click on Services.
Step 4: In the right pane, locate the service named Universal Plug and Play Device Host. Right-click the service and select Properties.
Step 5: Make sure that the Startup type is set to Automatic.
Step 6: Click Start and then click on OK once the service has finished starting.
Step 7: Locate the service named SSDP Discovery Service, right-click the service, and select Properties.
Step 8: Repeat Steps 5 and 6 for the SSDP Discovery Service.
About the firewall, I got it turned off. So i didn't worry much about it.
--------------------------------------------------------------------------------------------------
Restart your computer and start the game.

Note: Altought the "Message" still pops up when i host, I've never encountered any problem since. I've confirmed with few friends that can host, and it was said the "message" is a bug! whether you can host or not need to be tested.
P.S. wondering if this post could be pinned , for convenience. thanks alot.