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Re: Limit number of outgoing connections

To: a b <tripivceta@hotmail.com>
Subject: Re: Limit number of outgoing connections
From: Darren Reed <darrenr@reed.wattle.id.au>
Date: Sat, 23 Dec 2006 11:59:39 +1100
Cc: ipfilter@coombs.anu.edu.au
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In-reply-to: <BAY134-F383A27CBFC34F445885DD2DCCD0@phx.gbl>
References: <BAY134-F383A27CBFC34F445885DD2DCCD0@phx.gbl>
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a b wrote:
>> You can define a limit per-rule, like this:
>>
>> pass in proto tcp from any to any port  6881:6889  flags S keep state
>> (limit 10)
>
> Hello Darren,
>
> would you please elaborate more on the ####:#### port syntax? Must the
> (limit N) syntax be always combined with a port construct?

The limit is to do with states, not ports.


>> pass in proto tcp from any to any port  6881:6889  flags S keep state
>> pass in proto tcp from any to any port  = ssh  flags S keep state
>> (limit 10)
>>
>> Will *always allow* upto 10 ssh connections, even if there are 100
>> bittorrent
>> connections.
>
> Wouldn't it be cleaner to increase the size of the state table via an
> IPF directive?


No, because that is a global limit, not a local limit.

Darren


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