Date: Fri, 29 Jun 2001 20:21:11 -0400 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? Message-ID: <GPEOJKGHAMKFIOMAGMDIOEENDJAA.deepak@ai.net> In-Reply-To: <3B3AB4F8.184A2EFE@softweyr.com>
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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/
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