port forward is not needed from the modem to your pc- port forwarding applies if you are a running a router.
Lets say your pc currently has ip address of 80.1.1.1- an internet requests will carry this ip, and when these packets pass through the modem they will all go to your pc. If you have a router, your router will have that 80.1.1.1 (public) ip address, and you pc will have an ip like 192.168.1.2 (private). the port forwarding is needed to forward the packets from the public ip to private.
hth
MB
ps- i would also edit your post to remove the mac address of your modem
