From owner-freebsd-net@FreeBSD.ORG  Tue Jun 20 21:26:51 2006
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Date: Tue, 20 Jun 2006 14:26:47 -0700
From: Luigi Rizzo <rizzo@icir.org>
To: Brett Glass <brett@lariat.org>
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	from brett@lariat.org on Tue, Jun 20, 2006 at 03:22:46PM -0600
Cc: net@freebsd.org
Subject: Re: Best way to block a long list of IPs?
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On Tue, Jun 20, 2006 at 03:22:46PM -0600, Brett Glass wrote:
> At 03:07 PM 6/20/2006, Luigi Rizzo wrote:
>  
> >there are efficient tables in ipfw as well, which Ruslan implemented
> >some time ago -- yet another reason we should be grateful to him
> 
> How would I build a table of arbitrary IP addresses and be able
> to update it atomically (i.e. add and delete individual addresses
> and not lose all filtering when there was a modification)?

please have a look at the ipfw manpage, the relevant commands are

     ipfw table number add addr[/masklen] [value]
     ipfw table number delete addr[/masklen]

and the matching is as fast as a route lookup as it uses the same
type of data structure.

	cheers
	luigi