@jimp:
There are many better ways to tunnel than that, but yes equipment may limit what you can do…
GIF and GRE are best for tunneling traffic in the clear. Failing that, OpenVPN+null cipher works.
That's the plan, as soon as I can deploy the nano-bsd based box to my collocation service, but I want to wait with that until 2.1 is stable and released, because if something goes bad with the upgrade process, etc. I'd have to get a plane ticket to Michigan to go there and fix things ;)
@jimp:
Feel free to open up a ticket in redmine for the AH bits, but that's something that will probably need someone with motivation+knowledge or funding to fully resolve.
If it is what I think it is, it's at this point primarily a GUI issue, i.e. the GUI creates a bogus configuration, because it doesn't allow deselection of all encryption methods and delivers the encryption algorithms from the ESP settings to the AH setup.
If there are problems with AH itself, that's another issue, but I don't even get that far, beause AH is configured improperly by the GUI from what I can tell.
I'll file a redmine ticket…