On Sun, Jul 3, 2011 at 7:40 AM, geoffrey mendelson < geoffreymendel...@gmail.com> wrote:
> > On Jul 3, 2011, at 6:11 AM, Arie Skliarouk wrote: > > Hi, >> >> The company I work at uses openvpn extensively. We settled on UDP-based >> protocol as it is more effective than TCP based. >> >> Inter-Israeli VPN connection works perfectly all of the time, whereas >> international VPN has erratic behavior on at least one ISP. I suspect the >> ISP (XFone 018) dropping UDP packets occasionally during peak hours for >> following reasons: >> • ICMP ping to the internet-facing IP number of the VPN router >> works properly all of the time >> • over-VPN ping to some server has about 50% packet loss during >> peak hour (tested at 23:00) >> • on different ISP at the same time there was no packet loss >> • over-VPN ping on the same ISP worked perfectly in the morning >> hours >> > I would complain and show proof of lost traffic (traffic sent but not received) - Wireshark screenshots seems to do the trick. Ask them to have your specific port prioritized. If you're a good paying customer (non-dsl/cable), there's a good chance they could do something. If you want, prior to calling them, to combat them with their own weapon, thankfully there's a UDP protocol that probably no ISP would want to degrade; Try switching to port 53 :-) Perfectly legal. I think your choice of UDP over TCP is ill-advised, and > requires more research into the differences between the protocols, their > uses and goals. > > There's a very good reason of using UDP and not TCP for tunneling. http://sites.inka.de/bigred/devel/tcp-tcp.html HTH, -- Shimi
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