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vpn with hughes.net

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They aren't preventing it, the laws of physics are.  VPN tunneling requires a lot of traffic, and with 600ms plus latency, you get a traffic jam effect.  Some VPNs work better than others.  SSH VPN connections work great.  Almost as good a regular traffic.  SSL VPNs are also successfull.  However, if you are using an IPSEC VPN, you are pretty much screwed.  The heavy traffic and latency just don't work well over satellite. 

This isn't to say that IPSEC won't work over sat, but you would need configuation adjustments on the server side.  Probably increaing the TTL values and such.  Hughes also sells a VPN accelerator that is supposed to help, but I've never heard of anyone using it.

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