I have put my thoughts towards VPNs up on the wiki at:

http://www.bufferbloat.net/projects/bismark/wiki/VPN_solutions_under_evaluation

Completely outside for the scope of the existing tunneling scheme,  I have
had multiple requests for a working vpn solution from outside of this
project, so I hope to spend a little time next week looking into the
problems and alternatives as I catch up on cerowrt and iscwrt.

However, if you have any thoughts towards requirements or would be willing
to join in a test,
please add them to the wiki page.

-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://the-edge.blogspot.com