Can't open my NAT

Hi there.. i had that problem too and i just solved it...
heres the thing..
first you go into the router setup page.. which is.. 192.168.100.1
go to the gateway tab
go to port forwarding tab
go to config
thenTemplate --> custom
Name--> whatever
Port start--> 88
Port end-->88
LAN IP address--> check on your xbox on network settings and copy the same ip address.
Enable --> checked
Then click add.
After that.. you will do the same thing but on the port option you will put 3074. add it ..
now your nat should be open. ;)

Thhhhhhaaaaaaannnnnnxxxxxxx

It appear NAT is configured through firewall setting. Follow this steps and write down each changes you make.Incase the policy doesnt work you can always revert to original state:
Do not create a custom firewall policy unless you have the necessary expertise and the need to do so. Instead,
select one of the predefined policy templates as described in “Setting the Firewall Policy”.
To create a custom firewall policy, first select Custom and click Apply on the Firewall > POLICY — basic Page.
Then use this page to configure a custom firewall policy:
Steps
To select a predefined policy for all packets processed by the SBG900 firewall:
1 On the SBG900 Setup Program left panel, click Firewall.
2 Click POLICY.
3 Click basic to display the predefined firewall policy templates