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From: Florian Weimer <fweimer@bfk.de>
To: Steve Atkins <steve@blighty.com>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Best way to index IP data?
Date: Mon, 14 Jan 2008 09:27:52 +0100
Message-ID: <827iicizg7.fsf@mid.bfk.de> (raw)
In-Reply-To: <1259C7B1-C948-4326-B827-849C64B61A16@blighty.com>
References: <200801101614.54729.kevin@kevinkempterllc.com>
	<DA6DE53A-2F69-46F3-8C96-B341ADCDDFAF@blighty.com>
	<36e682920801101541o7626bbddj428617144240c554@mail.gmail.com>
	<Pine.LNX.4.64.0801111025390.30762@localhost>
	<13179.1200064791@sss.pgh.pa.us>
	<20080111162747.GT5294@mathom.us>
	<24044.1200082058@sss.pgh.pa.us>
	<20080111212703.GU5294@mathom.us>
	<20080111213710.GD8260@alvh.no-ip.org>
	<20080111220235.GX5294@mathom.us>
	<20080111222403.GA7527@crankycanuck.ca>
	<1259C7B1-C948-4326-B827-849C64B61A16@blighty.com>

* Steve Atkins:

> I don't think there's ambiguity about what an dotted-quad without a
> netmask means, and hasn't been for a long time. Am I missing
> something?

Classful addressing is still part of many user interfaces, for
instance Cisco's IOS.  It's not just that the CLI accepts it, it's
also the standard[*] output format (that is, "192.0.2.0" instead of
"192.0.2.0/24"; if no prefix length is given, the one based on the
class is used).

[*] I don't think you can switch it off.  Obviously, for backwards
    compatibility reasons, the default has to stay anyway.

-- 
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99



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