Me and my brother had been playing on the same internet connection all day. he had been receiving the NAT 3 issue type but it was not effecting us, we went out and both bought the expansion pack, and it stopped allowing us to join eachothers fireteam. please resolve this issue as it is very frustating and disappointing after spending $75 on DLC.
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Most routers can't handle more than one console at the same time. What are you using? What's your setup?