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Date:      Wed, 14 Jan 2009 12:13:06 -0500
From:      Steve Bertrand <steve@ibctech.ca>
To:        Pieter de Goeje <pieter@degoeje.nl>
Cc:        Artem Kuchin <matrix@itlegion.ru>, freebsd-questions@freebsd.org
Subject:   Re: Blocking very many (tens of thousands) ip addresses in ipfw
Message-ID:  <496E1D22.9070106@ibctech.ca>
In-Reply-To: <200901141801.45996.pieter@degoeje.nl>
References:  <496E117D.8030306@itlegion.ru> <200901141801.45996.pieter@degoeje.nl>

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Pieter de Goeje wrote:
> On Wednesday 14 January 2009 17:23:25 Artem Kuchin wrote:
>> I need to block around 150000 ip addreses from acccess the server at all
>> at any port.  The addesses are random, they are not nets.
>> These are the spammer i want to block for 24 hours.
>> The list is dynamically generated and regenerated every hour or so.
>> What is the most efficient way to do it?
>> At first i thought doing ipfw rules using 5 ips per rule, that would
>> result in 30000 rules! This will be too slow!
>> I need to something really quick and smart. Like matching the first
>> number from ip (195 from 192.1.2.3),
>> if it does not match - skip, if it does - compare the next one
>> and so on.
> 
> Quoting ipfw(8):
> LOOKUP TABLES
>      Lookup tables are useful to handle large sparse address sets, typically
>      from a hundred to several thousands of entries.  There may be up to 128
>      different lookup tables, numbered 0 to 127.
> 
> net.inet.ip.fw.dyn_buckets should probably also be increased to efficiently 
> handle 150k IPs.

Please correct me if I'm wrong, but if the OP is going to drop all
traffic immediately from the 150k IPs, then dyn_buckets shouldn't come
into play, as there is no dynamic rule generated.

Steve



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