Hi,
I haven't gotten an answer to this so I'm reposting it... Thanks for any suggestions.
I couldn't find this in the documentation, what is the setting for this upper limit on number of connections?
MAXPERC and MAXPERIP variables, set in the configuration file.
Also, this limit is based on certain window of time? What time frame constitutes "too many connections"?
The time frame is "at any given time". Connections from the same IP address or the same /24 where there are already the maximum number of existing connections, are rejected.
So actually this can't really prevent "floods", I mean there's a difference between getting 100 connections from an IP in a period of 1 day and getting 100 connections in a period of 1 minute. The first doesn't constitute a problem, the second represents a flood problem.
It's quite an important distinction and it's important to try and prevent floods.
Is the only way, then, to differentiate between the two to have a global filter running which keeps track of connections?
Well, I wouldn't say it's the *only* way. You could always patch Courier to add that functionality instead.
Or write a log monitor that looks for IP's that are doing this kind of thing to you, and then automatically edits your BLOCK rules or some such solution.
But if you're asking "do I have to write code myself to do this sort of thing?", then yes... I believe you probably do. -- Unless Sam is feeling very accommodating, and is working on it already and merely keeping quiet.
-jab
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