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Date:      Sun, 14 Nov 1999 12:56:49 -0500 (EST)
From:      "Crist J. Clark" <cjc@cc942873-a.ewndsr1.nj.home.com>
To:        green@FreeBSD.ORG (Brian Fundakowski Feldman)
Cc:        kris@hub.freebsd.org (Kris Kennaway), bvi@rucus.ru.ac.za (Barry Irwin), ipfw@FreeBSD.ORG
Subject:   Re: TOS support for FreeBSD
Message-ID:  <199911141756.MAA57969@cc942873-a.ewndsr1.nj.home.com>
In-Reply-To: <Pine.BSF.4.10.9911132148090.96933-100000@green.myip.org> from Brian Fundakowski Feldman at "Nov 13, 1999 09:50:35 pm"

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Brian Fundakowski Feldman wrote,
> On Sat, 13 Nov 1999, Kris Kennaway wrote:
> 
> > On Sat, 13 Nov 1999, Barry Irwin wrote:
> > 
> > > TOS is type-of-service, and is  determined by  bits 8->15 in the IP Header.
[snip]
> > > Linux ipchanis allows one to modify the tos bits on a packet providing it
> > > matches certain rules, this is the functionality I was wondering was
> > > avaliable in FreeBSD
[snip]
> For a modest price for time, I could have this in IPFW easily if you
> give me a description of what functionality is that which you want.
> Otherwise, I could put it on my list of things to add to the new IPFW
> (damn, I really need to write that paper!) when I work on that; or,
> I could get to it whenever I next get really bored :)

Hmmm... Personally, I would feel somewhat hesitant about adding it to
IPFW. I'm not usually one to worry much about "slippery slopes," but
once we add something to IPFW that actually modifies packets, where
does it end? To my knowledge, none of the IPFW options in presently in
existence change the contents of a packet. IPFW
accepts/drops/forwards/diverts a packet, but it does not change
it. To me, this simple set of abilities is a nice way to partition off
what IPFW does. We do not want rampant featurism in a kernel module
(not that adding this one thing would be, but it would be nice to
rewrite destinations of forwarded packets, and it'd be nice to...) 

The trouble is, where would you add this TOS rewrite?... Maybe a tool
that IPFW diverts the packets of interest to?

Just MHO and $0.02.
-- 
Crist J. Clark                           cjclark@home.com


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