Date: Tue, 1 Jul 2008 09:07:17 +0800 From: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au> To: freebsd-net@freebsd.org Subject: Re: Freebsd IP Forwarding performance (question, and some info) [7-stable, current, em, smp] Message-ID: <20080701010716.GF3898@stlux503.dsto.defence.gov.au> In-Reply-To: <alpine.LFD.1.10.0807010257570.19444@filebunker.xip.at> References: <4867420D.7090406@gtcomm.net> <200806301944.m5UJifJD081781@lava.sentex.ca> <20080701004346.GA3898@stlux503.dsto.defence.gov.au> <alpine.LFD.1.10.0807010257570.19444@filebunker.xip.at>
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0n Tue, Jul 01, 2008 at 03:00:31AM +0200, Ingo Flaschberger wrote:
>Dear Alex,
>
>> >OK, I setup 2 boxes on either end of a RELENG_7 box from about May
>> >7th just now, to see with 2 boxes blasting across it how it would
>> >work. *However*, this is with no firewall loaded and, I must enable
>> >ip fast forwarding. Without that enabled, the box just falls over.
>>
>> What is "ip fast forwarding" ?
>
>instead of copying the while ip packet into system memory, only the ip
>header is copyied and then in a "fast" path determined if it could be fast
>forwarded.
>if possible, a ned header is created at the other network-cards-buffer
>and the ip-data is copied from network-card-buffer to network-card-buffer
>directly.
So how does one enable "ip fast forwarding" on FreeBSD ?
-aW
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