[strongSwan] Replay window upper limit

Tobias Brunner tobias at strongswan.org
Wed Aug 31 18:46:27 CEST 2016

Hi Kapil,

> What is the upper limit on replay window size ? i didn't find any
> documentation on upper limit. is it dependent on Hardware, if so how to
> find the limit

There is no hard limit.  But since storing the window requires a certain
amount of memory per SA there is definitely some upper limit on any
given system.  Maintaining the window also imposes some overhead
(probably only relevant if the window is huge).

> After a certain limit, i am having some problem with IPsec connection. 

What number are we talking about here?  And what problem are you having?


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