From: Henrik Nordstrom <hno@marasystems.com>
To: Thomas Heinz <josef.k@mytomorrow.de>, netfilter@lists.samba.org
Subject: Re: Arbitrary Netmasks
Date: Tue, 28 May 2002 20:53:57 +0200 [thread overview]
Message-ID: <200205282053.57432@henrik.marasystems.com> (raw)
In-Reply-To: <3CF383A9.7000106@mytomorrow.de>
On Tuesday 28 May 2002 15:18, Thomas Heinz wrote:
> Netfilter supports arbitrary netmasks for IP addresses which is
> more powerful than just those IP/x (0 <= x <= 32) expressions.
> For example one could use IP/255.0.255.255 (IP/23.13.42.0 would
> also work ;-).
Yes, this is the fastest method when matching filter expressions..
> Are masks that cannot be expressed in the IP/x schmeme (at least
> not in one rule) used in practise? Are they used at all in firewall
> rulesets?
Not in real life networks, but such masks are useful in certain types
of expressions, for example load balancing based on destination, or
as wildcard matches for matching "all your routers / servers /
whatever" assuming you have a well structured addressing scheme in
your own networks..
Regards
Henrik
next prev parent reply other threads:[~2002-05-28 18:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3CF383A9.7000106@mytomorrow.de>
2002-05-28 14:07 ` Arbitrary Netmasks Filipe Almeida
2002-05-28 18:45 ` Henrik Nordstrom
2002-05-29 9:57 ` Filipe Almeida
2002-05-28 15:03 ` Patrick Schaaf
2002-05-28 18:53 ` Henrik Nordstrom [this message]
[not found] <Pine.LNX.4.44.0205281532550.12350-100000@dlang.diginsite.com>
2002-05-29 5:22 ` Thomas Lussnig
[not found] <20020528132402.GN9802@ns>
2002-05-28 13:30 ` Joost Remijn
2002-05-28 13:35 ` Thomas Heinz
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