I thought you might be interested in looking at How can I play ArmA2 with my friend.
https://forums.bohemia.net/forums/topic/95695-how-can-i-play-arma2-with-my-friend/?do=findComment&comment=1610102
× Pasted as rich text. Restore formatting
Only 75 emoji are allowed.
× Your link has been automatically embedded. Display as a link instead
× Your previous content has been restored. Clear editor
× You cannot paste images directly. Upload or insert images from URL.