TCP optimization over satelite link with encryption

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Nov 15th, 2007
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There's two WAN nodes on cisco 28xx and 871 with 2 satelite hops between them. Link throughput is 64Kb/sec. Encryption with IPSec tunnel applied between routers. TCP sessions in such a scheme are very slow and applications goes timed out. All my tries of RBSCP tunnel with IPSec encription between routers gave me no success.

Have anyone here real experience of implementing encrypted traffic transmition over slow satelite links?

Where should I look for a solution? Try RBSCP over IPSec harder? Try WAAS or Juniper WX or others?

I have nothing against Juniper but would it work good?

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mchin345 Wed, 11/21/2007 - 13:39
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The delay time increases the RTT at the end host and allows RBSCP time to retransmit lost TCP frames or other protocol frames. If the retransmission is successful, it prevents lost frame events from reaching the end host where congestion procedures would be enabled. In some cases the retransmission can be completed by RBSCP without inserting the delay. This option should be used only when the RTT of the satellite link is greater than 700 milliseconds.


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