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does SSLVPN or VPN use single session (thread) or multi-session?

Posted on 2014-03-17
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Last Modified: 2014-05-21
description of problem: I am connecting to office which has bandwidth connection to internet of 200mb/200mb from my home which has 25mb/3mb connection using SSLVPN. I am only getting bandwidth of 6mbps through the VPN tunnel no matter how many items I run at the same time. I have proven that a single thread will travel at 6mbps with latency of 75ms.
Question: does SSLVPN or VPN only use single session (thread) technology or does it use multi-session technology?  I can not seam to get anything through VPN on phone line over 6mbps.
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Question by:advancedmd
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7 Comments
 
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Expert Comment

by:Schuyler Dorsey
ID: 39934736
Did you test your upload or download via the vpn? If your ISP upload is 3mb then you should only count on uploading a max of 3mb across the VPN.

Also, the type of VPN is dependent on what VPN product you are using.
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Author Comment

by:advancedmd
ID: 39934770
I am testing download from office to home using iperf with multiple sessions. so I should get close to 20mbps. the devices that I have tried is a Juniper sa2500 and a Juniper MAG4610. they are both SSLVPN devices.
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Accepted Solution

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advancedmd earned 0 total points
ID: 39935189
ok, I just confirmed with Juniper that bother the Juniper sa2500 and the Juniper MAG4610 run singe session (thread) technology. so my question is now, does anyone know if there is a SSLVPN device on the market that runs multi-session technology?
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LVL 57

Expert Comment

by:giltjr
ID: 39937012
Does the VPN server at the office use any type of bandwidth limiting for VPN connections?

We limit bandwidth on VPN connection as we don't want employees working from home to to eat up all of our bandwidth.

What exact function do you want to do?  Example: Doing a file copy from a Windows server to your home computer uses SMB/CIFS, which depending on which OS the server and your home computer is running will be very slow.  SMB/CIFS is very sensitive to latency and 75ms is a lot of latency to overcome.
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Author Comment

by:advancedmd
ID: 39937057
it does have a setting for limiting bandwidth but we do not use it. at the present time that has not been an issue. we have a max of 200mb and we have not gotten much over 40mb on the sslvpn at any given time. as far as usage, we do not use SMB/CIFS, but they do use remote desktop a lot. but again, the main issue is that this device only uses single session (thread) technology  and at most incoming homes, they are only getting about 6mbps.
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LVL 57

Expert Comment

by:giltjr
ID: 39937087
Well RDP does not require anywhere near 6 Mbps.  If you are not doing SMB/CIFS, what are you doing that needs 6Mbps+ of downstream speed?

Maybe we can help tune it.
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Author Closing Comment

by:advancedmd
ID: 40079955
sa2500 is single session.
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