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Date:      Fri, 27 Feb 2004 10:43:39 -0800 (PST)
From:      Nate Lawson <nate@root.org>
To:        Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?= <des@des.no>
Cc:        cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sys/contrib/pf/net if_pflog.c if_pflog.h if_pfsync.c if_pfsync.h pf.c pf_ioctl.c pf_norm.c pf_osfp.c pf_table.c pfvar.h src/sys/contrib/pf/netinet in4_cksum.c
Message-ID:  <20040227104209.A86020@root.org>
In-Reply-To: <xzphdxc29a5.fsf@dwp.des.no>
References:  <200402260234.i1Q2YDx1014240@repoman.freebsd.org> <20040226060126.GA70201@troutmask.apl.washington.edu> <20040226015016.B23674@xorpc.icir.org> <20040226071123.A31631@xorpc.icir.org><xzpptc10vvv.fsf@dwp.des.no> <20040227004602.A73084@xorpc.icir.org> <xzphdxc29a5.fsf@dwp.des.no>

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On Fri, 27 Feb 2004, Dag-Erling [iso-8859-1] Sm=F8rgrav wrote:
> Luigi Rizzo <rizzo@icir.org> writes:
> > I believe this (convert the entire networking stack to netgraph
> > nodes) is completely unfeasible.
>
> It shouldn't be.  Open any textbook on computer networking and you'll
> find that netgraph is the canonical way to organize a protocol stack.
>
> > There are interactions among subsystems all over the place.
>
> Otherwise known as "layering violations" and "bugs".

Not necessarily.  I like Dave Clark's point that layers are a good way to
specify networking standards but a poor way to implement them.  This talk
is old but gives good info on one way of doing it:

http://www.root.org/ip-development/talks/vj-nkarch.ps.gz

-Nate



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