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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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dissolved
Asked:
dissolved
5 Solutions
 
Cyber-DudeCommented:
Simple
It depends what encryption method you are using, what capacity, what client and forth... Typically VPN connection does slow performance due to the fact that each packet is somehow encrypted.

Cyber
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PennGwynCommented:
Consider also that "web-browsing, FTP, email" can all benefit from compression, and possibly caching.  Encrypted traffic can't.

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LimeSMJCommented:
VPN packets are encrypted so they add significant overhead to the packet - the data capacity of each packet is reduced to make room for the VPN goodies.  So even though the connection speed is identical, the actual data throughput is reduced.

Also, encryption/decryption adds latency to the connection... which is why they have hardware VPN solutions to speed up the processing of these packets (software vs. hardware).  In addition to hardware encryption/decryption, the satellite companies may use faster transmission hardware, different protocols, or perhaps better switching networks also.
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OliWarnerCommented:
Satellite also has a huge latency so with encrypted VPN a lot of stuff takes even longer than with a conventional connection.
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rtptucksCommented:
This is due to the upload stream being poor with satellite and intermitent, therfore loosing its vpn connection and having to re-authenticate.
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dissolvedAuthor Commented:
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.
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