[ILUG] Iptables to redirect outgoing http to another proxy ?

[Paul Jakma]

On Thu, 25 Nov 2004, Declan Grady wrote:

> Hi Paul,
> My tcp_rmem has the values : 4096    87380   174760

Yep, that's the default.

> From your note above, (512/8)*1.2 gives me 76.8 .. I guess this 
> should then become 76.8*1024 to give 78643 ?

Right.

> .. so I should leave it as it is ?

You could try increasing it actually. Depends on how much RAM you 
have really. You need at least (bandwidth*latency[1]) for TCP to be 
able to make full use of a link, you need more to be able to 
accomodate retransmits/errors.

So, you could try bumping that middle value up a bit (RAM 
permitting), which might help performance a bit if/when your sat-link 
experiences congestion.

Google for TCP bandwidth-delay product for (vast amounts of) 
background information.

> Or am I on the wrong track ?
>
> Thanks,
> Declan

1. link latency - not RTT as ping measures. But in your case, the RTT 
figures you get will likely be dominated by sat-link latency, so your 
ping times are probably equivalent to your sat-link latency.

regards,
-- 
Paul Jakma	paul at clubi.ie	paul at jakma.org	Key ID: 64A2FF6A
Fortune:
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