From owner-freebsd-net  Fri Jun 29 10:27: 4 2001
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Reply-To: "matt" <matt-l@pacbell.net>
From: "matt" <matt-l@pacbell.net>
To: "Clark Gaylord" <cgaylord@vt.edu>, <freebsd-net@freebsd.org>
References: <GPEOJKGHAMKFIOMAGMDICEOJDGAA.deepak@ai.net><20010626093545.D49992@sunbay.com> <3B3AB4F8.184A2EFE@softweyr.com> <20010629075815.N55750@e028121.vtacs.vt.edu>
Subject: Re: fastforwarding?
Date: Fri, 29 Jun 2001 10:19:33 -0700
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So look like the fastforward is done at the either
input/output? the so called layer 2?

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----- Original Message -----
From: Clark Gaylord <cgaylord@vt.edu>
To: <freebsd-net@freebsd.org>
Sent: Friday, June 29, 2001 4:58 AM
Subject: Re: fastforwarding?


> On Wed, Jun 27, 2001 at 10:39:20PM -0600, Wes Peters
wrote:
> > Ruslan Ermilov wrote:
> > > On Mon, Jun 25, 2001 at 06:47:41PM -0400, Deepak
Jain wrote:
> > > > ...
> > > > What does the fastforwarding option do that the
normal forwarding option
> > > > doesn't?
> > > >
> > > See inet(4).
> >
> > The description there isn't very forthcoming.
fastforwarding caches
> > the results of a route lookup for destination
addresses that are not
> > on the local machine, and uses the cached route to
short-circuit the
> > normal (relatively slow) route lookup process.  The
packet flows
> > directly from one layer2 input routine directly to
the opposing
> > layer2 output routine without traversing the IP
layer.
>
> I notice the man page points out that this prevents
the use of
> ipfilter, etc.  The first packet(s?) do get forwarded
by the usual
> process (yes?), so does this imply that at least a
"deny X" would
> still work (as the first packet would get denied and
hence the
> cache does not get populated)?  What are the
limitations to ipfw
> and friends working right in conjunction with
fastforwarding?
>
> Clark
>
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