[CentOS] Performance of CentOS as a NAT gateway

Ross S. W. Walker rwalker at medallion.com
Sun Sep 9 19:03:27 UTC 2007

Bart Schaefer wrote:
> On 9/9/07, Barry Brimer <lists at brimer.org> wrote:
> > What is the speed of the link between you and the ISP?
> 100Mb/s.
> > Do they have other customer sites that are set up the same 
> way as yours
> > that get significantly better performance?
> They don't have any other sites set up this way to compare.

I would then suggest getting a wireshark setup to monitor
the traffic as it passes through the gateway.

If the gateway host doesn't have a GUI then I suggest another
host with 2 interfaces, one on each side of the NAT and
compare the timestamps of traffic coming in from the Internet
to the NAT, out of the NAT to the client, in to the NAT from
the client and out of the NAT to the Internet.

By looking at how fast traffic goes out to and is ack'd by
the remote site can tell you exactly where the bottlenecj is.


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