From: "/dev/rob0" <rob0@gmx.co.uk>
To: netfilter@vger.kernel.org
Subject: Re: Poor upload speed with NAT
Date: Tue, 11 Aug 2009 10:29:40 -0500 [thread overview]
Message-ID: <200908111029.42368.rob0@gmx.co.uk> (raw)
In-Reply-To: <1f4ef0970908110722i41e934bcm48b2ba0d66587dcf@mail.gmail.com>
On Tuesday 11 August 2009 09:22:17 Steve Brown wrote:
> > I always *NAT in PREROUTING and MASQUERADE in POSTROUTING if
> > needed.
>
> According to the manpage for iptables, SNAT is only valid in the
> POSTROUTING chain. Is this incorrect?
MASQUERADE is a form of SNAT (source NAT). SNAT is done in the
POSTROUTING chain.
> > Have never seen any such performance drop on multiple NIC.
>
> Neither have I, which is why this is bothering me.
I can't really comment on this. You might consider doing some
troubleshooting to test your hypothesis, such as tcpdump(1) of some
poor-performing connections. You haven't posted anything here which
lends credence to it.
On Monday 10 August 2009 16:43:14 you wrote:
> I'm running a custom 2.6.30.3 kernel.
Do the same symptoms manifest when you're running the distro kernel?
The custom kernel would be a possible suspect.
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next prev parent reply other threads:[~2009-08-11 15:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-10 21:43 Poor upload speed with NAT Steve Brown
2009-08-10 23:43 ` Amos Jeffries
2009-08-11 14:22 ` Steve Brown
2009-08-11 15:29 ` /dev/rob0 [this message]
2009-08-11 15:58 ` Steve Brown
2009-08-12 14:02 ` Steve Brown
[not found] ` <4A82D82F.1000003@shorwall.net>
2009-08-12 16:03 ` Steve Brown
2009-08-12 16:03 ` Tom Eastep
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