The overhead of layer 2/3 packet headers in OpenVPN did not cause such a huge slowdown, its much more likely that OpenVPN was operating in TCP mode, and thus su

The overhead of layer 2/3 packet headers in OpenVPN did not cause such a huge slowdown, its much more likely that OpenVPN was operating in TCP mode, and thus subject to the tcp-in-tcp[1] problem with tunnel internal tcp sessions. Even an extraordinarily slow machine by modern standards can manage 100mbit openVPN without much of an issue. EDIT: did not see UDP results. There is still something else going on here, thats still much too slow for openVPN (without tweaking). [1] http://sites.inka.de/bigred/devel/tcp-tcp.html http://sites.inka.de/bigred/devel/tcp-tcp.html