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Date: Thu, 09 Feb 2012 14:47:00 -0800
From: Julian Elischer <julian@freebsd.org>
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To: Gleb Smirnoff <glebius@freebsd.org>
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Cc: Ermal Lu?i <eri@freebsd.org>, freebsd-net <freebsd-net@freebsd.org>,
	Luigi Rizzo <rizzo@iet.unipi.it>, freebsd-hackers@freebsd.org
Subject: Re: [PATCH] multiple instances of ipfw(4)
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On 2/8/12 6:09 AM, Gleb Smirnoff wrote:
> On Wed, Feb 08, 2012 at 03:04:09PM +0100, Ermal Lu?i wrote:
> E>  2012/2/8 Gleb Smirnoff<glebius@freebsd.org>:
> E>  >  On Tue, Jan 31, 2012 at 12:02:04PM +0100, Luigi Rizzo wrote:
> E>  >  L>  if i understand what the patch does, i think it makes sense to be
> E>  >  L>  able to hook ipfw instances to specific interfaces/sets of interfaces,
> E>  >  L>  as it permits the writing of more readable rulesets. Right now the
> E>  >  L>  workaround is start the ruleset with skipto rules matching on
> E>  >  L>  interface names, and then use some discipline in "reserving" a range
> E>  >  L>  of rule numbers to each interface.
> E>  >
> E>  >  This is definitely a desired feature, but it should be implemented
> E>  >  on level of pfil(9). However, that would still require multiple
> E>  >  instances of ipfw(4).
> E>  >
> E>  This opens a discussion of architecture design.
> E>  I do not think presently pfil(9) is designed to handle such thing!
>
> Several years ago, I guess around 2005, a discussion on a per-interface
> packet filtering was taken on the net@ mailing list. In that time, it lead
> to nothing, several people were against the idea.
>
> Recently on IRC I had raised the discussion again. Today more people liked
> the idea and found it a desired feature.
>
> Many kinds of high end networking equipment have per-interface ACLs. I know
> that networking sysadmins would be happy if FreeBSD packet filters would
> get this feature, since maintaing such ACLs is much easier on a router with
> dozens of interfaces.

I think it is a good idea. not only for interfaces but certain routing 
and bridging paths too.