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Date: Thu, 13 Jul 2006 21:54:04 +0300 (EEST)
From: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua>
To: Brian Candler <B.Candler@pobox.com>
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Cc: freebsd-net@freebsd.org, Ensel Sharon <user@dhp.com>
Subject: Re: counting (not) blocks of IPs in ipfw - please help
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Hello!

On Wed, 12 Jul 2006, Brian Candler wrote:
> Firstly, "from any XXX" is giving two different 'from' items. I guess you
> meant "from not { 10.20.0.0/16 or 10.30.0.0/16 }". But that doesn't work
> either:
>
> # ipfw add 00100 count ip from not { 10.20.0.0/16 or 10.30.0.0/16 } to any
>   via fxp0 in
> ipfw: hostname ``{'' unknown
>
> ...
> The obvious boolean transformation doesn't work, since "and" is not allowed
> either: i.e.
>
> # ipfw add 00100 count ip from { not 10.20.0.0/16 and not 10.30.0.0/16 } to
>    any via fxp0 in
> ipfw: missing ")"

  Correct, there is no 'and' keyword in ipfw syntax, since it's redundant:
a simple ',' in address list means 'and'. So this can be written as:

ipfw add 100 count ip from not 10.20.0.0/16,10.30.0.0/16 to any via fxp0 in

since 'not' in the src and dst definitions refers to the whole list:

   addr: [not] {any | me | me6 table(number[,value]) | addr-list | addr-set}

(an '|' is missing between 'me6' and 'table...' here, isn't it?)

Sincerely, Dmitry
-- 
Atlantis ISP, System Administrator
e-mail:  dmitry@atlantis.dp.ua
nic-hdl: LYNX-RIPE