Re: ipfilter tuning

Darren Reed <[email protected]> Thu, 12 Nov 2009 10:57:26 -0800
Newsgroups gmane.comp.security.firewalls.ipfilter
Message-ID <22993_1258052350_4AFC5AFD_22993_2417_1_4AFC5A96.6080402@reed.wattle.id.au>
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Steve Clark wrote:
| Hi Darren,
|
| Do you have any recommendations on how to size the various
| tables in ipfilter.

Start with how many concurrent connections you expect there to be.
10, 1000, 10000, 250000, 4000000...?

If you're going to support 5,000 logged in users to a web site, each one 
of those is going to need 'n' connections to the web server, so maybe 
you end up at 50,000 concurrent connections.

Web connections are normally short lived, but they still need to time 
out properly.

So 50,000 concurrent sessions multiplied by 2*TCP_MSL (240) becomes a 
table size of no less than 1,200,000.

Darren

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