Can't connect to a friend's xbox live party/Both have open NAT types

So I live in an apartment complex, and do not have access to a modem. I originally was just running a ethernet cord from a port in the wall to my xbox to connect, but always had either a strict or moderate nat type. Since then, I have bought a router in
an attempt to get past any firewall that might be blocking me. I went straight to setting up my xbox with a static ip that i put as my router's dmz. This didn't change a thing, so I attempted to open up the ports suggested by the Xbox internet page, which
didn't either. I then went on to try enabling the UPnP on my router, which has opened my NAT type. I was able to connect to my friend on a regular basis for awhile, but since then, we rarely can connect, even though we both have open NAT types. Resetting
routers doesn't change a thing, so I was just curious what our next step might be, or if not having access to a modem will be a major roadblock.

:)

 

Xbox connection issues HELP!!!

Are you sharing internet connection? Because this "both have open NAT types" sounds like you are sharing internet.

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Xbox connection issues HELP!!!

Why do I only disconnect from an xbox live party when a certain person joins my party? It also causes whatever game I'm playing to lag and sometimes disconnect. Really frustrating. We both have open NAT types. Otherwise connection is flawless. Even have gone into my router settings and opened all necessary ports. PLEASE HELP!!!