[strongSwan] max number of SAs

Miroslav Kubiczek miroslav.kubiczek at adaptivemobile.com
Thu May 22 13:28:09 CEST 2014

Hi Martin,

Thanks for info. I’ll go through this.
I have one more things which is not clear to me: I started VPN gateway and three clients. Then after few minutes I see this stats (simultaneously):

Security Associations (5354 up, 2053 connecting)

Security Associations (5744 up, 0 connecting)
Security Associations (4014 up, 0 connecting)
Security Associations (2938 up, 0 connecting)

I’d expect sum of SAs on clients should equal SAs on the GW. Any idea what the numbers don’t match?


On May 22, 2014, at 12:43 PM, Martin Willi <martin at strongswan.org> wrote:

> Hi Miro,
>> Security Associations (4595 up, 587 connecting)
>> Is there a way to get more? What's the main blocker?
> There is no hard limit for the number of SAs in strongSwan. Most likely
> you are initiating just too many connections simultaneously, and your
> responder can't handle that load.
> To properly configure strongSwan to handle many tunnels, refer to [1]
> and [2]. Usually public key cryptography is the limiting factor
> regarding tunnel setup rate, [3] has some numbers.
> Regards
> Martin
> [1]http://wiki.strongswan.org/projects/strongswan/wiki/IkeSaTable
> [2]http://wiki.strongswan.org/projects/strongswan/wiki/LoggerConfiguration#Performance-consideration
> [3]http://wiki.strongswan.org/projects/strongswan/wiki/PublicKeySpeed

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