I see that a number of people have questions about Port Forwarding... check this site... this guy Shane is very good in explaining about Port Forwarding.
http://www.pcwintech.com/Although he supports the Lorex DVR.. there are many lessons you can learn about his tech tips. Check out the SUPPORT FORUMS on that site.
Just remember... for the IP Camera Settings..
NOTE:
Set the IP Address to a Static Address. So that if you power off your router and/or the camera, it will use still use the same static IP address.
Gateway and DNS Server should have the IP Address of your Router's IP Address.
Subnet Mask: I always use 255.255.255.0
Http Port: use something else other than 80... sample use ==> 8080