Hi all,
I've been trying to do some testing in our lab.
We rather find out about impact and limitations in the lab than later on in
real live ;-)
I use to think that the max number of unnels per vpn-process was limited to 250,
But much to my surprise, this is apparently an urban-legend.
>From my test-laptop I could easily create 500 parallel vpn-tunnels...
Trying to push it even further, I got to exact 1024 tunnels.
Multiple client-processes, all with unique key/cert, towards a single
vpn-server-process
At the server-side, the openvpn-process is configured for 2048 clients
(max-clients, & network for tunnel)
The fact that it stops exactly at 1024, makes me wonder what is causing this
limit..
Is it a kernel parameter maximizing the number of tun-devices?
When examining the contents of /var/log, neither syslog nor kernel showd
anything related
Same with looking at sysctl -a.
Also when starting the finale one (#1025) and raising verbose from 0 to 8,
nothing peculiar shows in the output.
So is it valid to assume there is a hardcoded (but undetectable) limit of 1024
tun-devices ?
Hans
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