Hi, On 17/12/14 04:26, Daniel Miller wrote: > Slightly off-topic - but... > > I've noticed that my "normal" or direct ssh connections from my home > (Windoze) to my office (Linux) can be subject to instability - > particularly if I simply leave PuTTY connected and idle for a while at > some point it will get disconnected. However...if I activate my OpenVPN > tunnel (standard routed UDP), and then ssh to the office via the VPN - I > can leave it online for days without interruption. It just works. It's > so reliable it's boring. > > This begs the question - how is OpenVPN providing such apparent superior > connection quality for ssh compared to a direct connection? > this is actually one of the great benefits of using OpenVPN over UDP - it will mask out a flaky wireless or internet connection. A standard SSH connection is TCP based. If such a connection is disrupted for some reason (actual TCP disconnect) then the SSH session can be stopped. OpenVPN over UDP is stateless, hence it does not really know if the UDP connection is "gone" - it will simply keep sending packets and wait for answer (for a certain period of time). So, if your home internet connection drops out for , say, 20 seconds then the OpenVPN connection remains intact and so will all TCP-based sessions that are running over it.
HTH, JJK ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ Openvpn-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/openvpn-users
