Freebsd IP Forwarding performance (question, and some info) [7-stable, current, em, smp]

Wilkinson, Alex alex.wilkinson at
Tue Jul 1 01:07:49 UTC 2008

    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 
    >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 

So how does one enable "ip fast forwarding" on FreeBSD ?


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