NAT performance

Jozsef Kadlecsik kadlec at
Fri May 13 11:22:08 CEST 2005

On Fri, 13 May 2005, Christophe SUIRE wrote:

> This not a problem with the network card, because when i do the test
> with only firewall routing i have a total bandwidth used near to
> 500Mbit/s.
> But when i add an SNAT translation for each network (10) the total
> bandwidth used is near 170Mbit/s.
> So why this important difference without an with NAT ??

NAT *is* expensive. Have a look at the paper on netfilter performance
tests and comparisons at

Best regards,
E-mail  : kadlec at, kadlec at
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Address : KFKI Research Institute for Particle and Nuclear Physics
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