Date: Wed, 27 Jun 2001 22:39:20 -0600 From: Wes Peters <wes@softweyr.com> To: Ruslan Ermilov <ru@FreeBSD.org> Cc: Deepak Jain <deepak@ai.net>, net@FreeBSD.org, hackers@FreeBSD.org Subject: Re: fastforwarding? Message-ID: <3B3AB4F8.184A2EFE@softweyr.com> References: <GPEOJKGHAMKFIOMAGMDICEOJDGAA.deepak@ai.net> <20010626093545.D49992@sunbay.com>
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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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