First of all, obtain a Terminal Console program. I highly recommend PuTTY, which can be obtained from this download link:
https://cs.senecac.on.ca/~oop344/putty.exe[/code:3rqth8p6]
Open PuTTY and type in your router's homepage in the entry labelled 'Host Name (or IP address)'. (Your router homepage will be either 10.0.0.138 or 192.168.1.254, and both should work) and choose the 'Telnet' option underneath it.
A Command Prompt-like interface will open, and you'll be asked to enter the Username and Password required to access your router. (Your Username should be 'admin' and your Password should be [blank], so just press the enter key. Use your own Username and Password if you have changed them).
Once you have logged into your router, copy the following lines and paste them into PuTTY's interface (Copy each line, one at a time, and use the Right Mouse Click to paste):
connection bind application CONE(UDP) port=3478-3479
connection bind application CONE(UDP) port=3074-3075
connection bind application CONE(UDP) port=3658
saveall
Close the session.
Flick the router's power switch off, then on.
You should have Open NAT when you play Black Ops now.
This method was discovered by the users 'AgroAnt' and 'Revs Per Min' from the Whirlpool Forums:
[code:3rqth8p6]http://forums.whirlpool.net.au/forum-replies.cfm?t=1739702