The tunneling software that I am aware of uses specific protocols and/or ports. These are not typically allowed in the locations I frequent (hotels / customer sites). Is there any v4/v6 tunneling software out there that allows me to set up a tunnel over a v4 port 80/port 443 connection? I would probably involve some server side stuff as well, or that could be a commercial service. I'll summarize the answers and put them on the wiki.