ppp/pptp disable multiple login

[Hetz Ben Hamo]

Hi,

I'm trying to find a simple solution to a small problem: I built a PPTP
service, but I want to disable the option to let a user login multiple times
at once.
I looked at poptop and other related packages and I cannot find anything,
which is quite surprising. Someone suggested me to look at PAM but that
didn't get me too far, I didn't see there any such option.

Any suggestion?

Thank,
Hetz
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