Date: Fri, 29 Jun 2001 11:18:31 -0500 From: Alfred Perlstein <bright@sneakerz.org> To: Clark Gaylord <cgaylord@vt.edu> Cc: freebsd-net@freebsd.org Subject: Re: fastforwarding? Message-ID: <20010629111830.F78038@sneakerz.org> In-Reply-To: <20010629075815.N55750@e028121.vtacs.vt.edu>; from cgaylord@vt.edu on Fri, Jun 29, 2001 at 07:58:16AM -0400 References: <GPEOJKGHAMKFIOMAGMDICEOJDGAA.deepak@ai.net> <20010626093545.D49992@sunbay.com> <3B3AB4F8.184A2EFE@softweyr.com> <20010629075815.N55750@e028121.vtacs.vt.edu>
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* Clark Gaylord <cgaylord@vt.edu> [010629 06:59] wrote: > 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? I really doubt that your assumptions are true. -- -Alfred Perlstein [alfred@freebsd.org] Ok, who wrote this damn function called '??'? And why do my programs keep crashing in it? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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