Max number of users on a VPN

Posted on 2015-01-08
Last Modified: 2015-01-08
Hello Experts - I have a Fortinet 90d firewall acting as a VPN endpoint on a 10mb MPLS circuit.  Before we wind up with a snow day I'd like to try and determine how many users I can comfortably get on the VPN.  Could anyone provide an estimate?
Question by:danbrown_
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Expert Comment

by:Don Johnston
ID: 40538630
The spec sheet says 1,000 client to Gateway IPSec tunnels and 200 Concurrent SSL-VPN Users  (Recommended Maximum).

So I'm going to say 200.

But depending on how fast of a link you have, it be unusable way before you hit 200.
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Expert Comment

ID: 40538631
According to Fortigate's own literature, the recommended max is 200.

Author Comment

ID: 40538637
I understand the theoretical max, I'm looking for the practical max.  I can assure everyone that there is no way 200 concurrent users are getting on the VPN with a 10mb circuit.
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Expert Comment

ID: 40538658
Thanks for the assurance. I think we're all in agreement.
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Accepted Solution

Don Johnston earned 500 total points
ID: 40538659
There are really too many variables to accurately identify how many functional connections you can have.

What I would do is get a VPN session established with the typical usage for the remote clients (whatever that is).  Then monitor the amount of bandwith that connection is using.  With that factored against the connection speed, you should be able to identify an optimal and max number of connections (assuming no other traffic).

Author Comment

ID: 40538672
Its SSL.  Most users will be coming in over the VPN and using remote desktop to connect to their machines here.  There are also a few laptop users who will work directly from the file shares.  

I'll try adding up average use on one connection and go from there, thanks all.

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