Youngstown

Hi, I read the stickies and did a website search but wasn't able to come up with any answers so here goes... My brother and I share a router, each of us have seperate Steam versions of ARMA II and OA(completely separate keys), DayZ 1.7.1 w/ newest ARMA beta patch. Both computers are newer(within a year) and have adequate hardware. We use Six Launcher to access Dayz servers. We can join separate servers but never the same one, the person who logs in first gets kicked by the 2nd person. Tried changing ports on both machines and reset wireless router to no avail. We've also tried launching the game and connecting to servers via Steam, Six Launcher or just through the regular in-game browser itself with no success. Any suggestions on how we can fix this problem and play on the same server together? Thanks for any feedback. ~Youngstown