From owner-freebsd-net  Fri Jun 29  5: 9:48 2001
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From: Mike Tancsa <mike@sentex.net>
To: des@ofug.org (Dag-Erling Smorgrav)
Cc: freebsd-net@freebsd.org
Subject: Re: fastforwarding?
Date: Fri, 29 Jun 2001 08:09:39 -0400
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References: <GPEOJKGHAMKFIOMAGMDICEOJDGAA.deepak@ai.net> <20010626093545.D49992@sunbay.com> <3B3AB4F8.184A2EFE@softweyr.com> <SEN.993760413.103708646@news.sentex.net>
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On 28 Jun 2001 16:33:33 -0400, in sentex.lists.freebsd.net you wrote:

>Wes Peters <wes@softweyr.com> writes:
>> 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=20
>> directly from one layer2 input routine directly to the opposing=20
>> layer2 output routine without traversing the IP layer.
>
>And more importantly, without traversing ipfw or ipfilter.  In other
>words, don't use this on a firewall.


Are there any other caveats ?  I seem to recall from way back something
about this (or maybe I am thinking of something else) being count
sensitive. e.g. that over x amount of routes, its not worth it to enable.

	---Mike
Mike Tancsa  (mdtancsa@sentex.net)	=09
Sentex Communications Corp,   	=09
Waterloo, Ontario, Canada
"Given enough time, 100 monkeys on 100 routers=20
could setup a national IP network." (KDW2)

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