From owner-freebsd-net  Fri Jun 29 17:17:27 2001
Delivered-To: freebsd-net@freebsd.org
Received: from aries.ai.net (aries.ai.net [205.134.163.4])
	by hub.freebsd.org (Postfix) with ESMTP
	id 9F99137B403; Fri, 29 Jun 2001 17:17:20 -0700 (PDT)
	(envelope-from deepak@ai.net)
Received: from blood (adsl-138-88-72-201.dc.adsl.bellatlantic.net [138.88.72.201])
	by aries.ai.net (8.9.3/8.9.3) with SMTP id UAA28838;
	Fri, 29 Jun 2001 20:19:23 -0400 (EDT)
	(envelope-from deepak@ai.net)
Reply-To: <deepak@ai.net>
From: "Deepak Jain" <deepak@ai.net>
To: "Wes Peters" <wes@softweyr.com>,
	"Ruslan Ermilov" <ru@FreeBSD.ORG>
Cc: <net@FreeBSD.ORG>, <hackers@FreeBSD.ORG>
Subject: RE: fastforwarding?
Date: Fri, 29 Jun 2001 20:21:11 -0400
Message-ID: <GPEOJKGHAMKFIOMAGMDIOEENDJAA.deepak@ai.net>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0)
Importance: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200
In-Reply-To: <3B3AB4F8.184A2EFE@softweyr.com>
Sender: owner-freebsd-net@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-net.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-net>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-net>
X-Loop: FreeBSD.org


Thanks, this explanation is far more clear. It is much similar to fast
switching on a Cisco or similar piece of gear.

DJ

-----Original Message-----
From: owner-freebsd-hackers@FreeBSD.ORG
[mailto:owner-freebsd-hackers@FreeBSD.ORG]On Behalf Of Wes Peters
Sent: Thursday, June 28, 2001 12:39 AM
To: Ruslan Ermilov
Cc: Deepak Jain; net@FreeBSD.ORG; hackers@FreeBSD.ORG
Subject: Re: fastforwarding?


Ruslan Ermilov wrote:
>
> On Mon, Jun 25, 2001 at 06:47:41PM -0400, Deepak Jain wrote:
> > sysctl -A |grep forward
> > net.inet.ip.forwarding: 1
> > net.inet.ip.fastforwarding: 0
> > machdep.forward_irq_enabled: 1
> > machdep.forward_signal_enabled: 1
> > machdep.forward_roundrobin_enabled: 1
> >
> > 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.

--
            "Where am I, and what am I doing in this handbasket?"

Wes Peters                                                         Softweyr
LLC
wes@softweyr.com
http://softweyr.com/

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message