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MTU, NAT, UPNP errors

I am trying to connect my xbox 360 to my wireless router. First, I encountered the MTU error. I did what someone said and shut off my firewall. I then was able to connect to the internet, but it gave me a NAT error. I was going to try to enable the upnp, but I am hitting a roadblock. PLEASE HELP! I called verizon and the woman said she had no idea. I got frustrated and hung up. I'm ready to head back to comcast and sacrifice a little bit more money for better service and internet.