Actually, this came up recently here on HN, referring to a rather old article entitled "Why TCP Over TCP Is A Bad Idea". Discussion and link to original article

Actually, this came up recently here on HN, referring to a rather old article entitled "Why TCP Over TCP Is A Bad Idea". Discussion and link to original article here: http://apps.ycombinator.com/item?id=2409090 http://apps.ycombinator.com/item?id=2409090 Bottom line; use UDP for your tunnels and a proper VPN.