My friend is on an uni where most of the ports are blocked so he can't even play games online, 80 is open obviously. The idea is "I will set up VPN tunnel on :80 on my router, so you should be able to connect to it and we can happily play again".
Now I wonder how much is this likely to fly...? What are the potential/usual obstacles here? (Besides the fact that I get annoying warning messages in the log.) Is it safe to say that when my friend can reach my webserver the VPN will work as well?