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From Konstantin Kolinko <>
Subject Re: How to limit the number of sessions per IP address (DOS attacks)
Date Mon, 01 Oct 2012 10:42:31 GMT
2012/10/1 Brian Braun <>:
> Hi Constantine,
> 1- I had almost decided to program a filter. However, I have found this
> solution:
> What do you think about it? I havent tried it yet, but as far as I can tell
> it looks good. It would help me to know how many sessions exist for a
> certain IP. Knowing that, I could deny more sessions for that IP (even
> though the procedure to deny is not included in this code).

Yes, something like that.

I note though that I'd expect that getCount() method implementation to be slow.

Whether do you notice the slowness or not depends on the actual count
of sessions on your server.

> 3- Thanks a lot for reminding me about the manager tag. I had almost forgot
> about it. However, the attribute "maxActiveSessions" limits the total of
> sessions among all the visitors, not specifically the total of sessions FOR
> A CERTAIN IP, or does it?

Yes, the total count of active sessions. I think it would be better
than to allow Tomcat to crash. Though it might disrupt service for the
legitimate demo clients.


Best regards,
Konstantin Kolinko

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