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Why is VPn over regular satellite slow?

Been doing a lot of research. Apparently web-browsing, FTP, email is fine when you a regular person using satellite to access the internet.

However, if you try to do VPN over a satellite connection, performance suffers badly. It is typically 33kbps or less. Why is this so? Is it the tunneling that causes the problems?(this is true with both client/server and site to site)

However:
I noticed now, that internet satellite providers are starting to provide their own VPN services which are just as fast as cable/dsl. Can anyone explain what they do differently to make it fast?

Thanks

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ASKER

Thanks a lot guys. We are working ousing satellite for one of our remote VPNs. Going to be a site to site vpn back to headquarters. Satellite provider said doing IPSEC over regular satellite will work, but may have slow performance. They offer their own type of VPNnn connection that is fast.

Again, thanks for all the useful info from everyone.