This isn't a general howto on VPN technology, it isn't even a howto on OpenVPN. You can find those kind of things elsewhere, and hopefully the references I include contain some useful pointers to suitable sites. This is the story of a particular problem I wanted to solve. If you're trying to set up a bridged OpenVPN system perhaps this will be of use to you. Or perhaps it won't. I'm sure when I want to do this again in six months time it'll be of use to me though! :) I needed to access a remote LAN in a small office elsewhere.