Re: [squid-users] Intercepting with iptables: DNAT vs REDIRECT

From: Amos Jeffries <>
Date: Wed, 23 Oct 2013 19:34:11 +1300

On 23/10/2013 7:22 p.m., Dan Charlesworth wrote:
> Very edifying. Thanks so much for that Amos.
> While the thread’s going, would you be able to elaborate at all on the “trickery with multiple rules and IPs”?

Well, normally you cant use more than 64K ports on one IP address. But
you can setup multiple rules load balancing traffic across N Squid
listening ports. This has a couple of useful side effects:
  1) 64K ports multiplies up by N
  2) Squid accept() rate limiters are also raised by a multiple of N.
The default IIRC is up to 15 accept() every select loop. On high traffic
load making that 15*N can be faster.

This can be done to spread across either Squid listenng ports by port
number, or by IP address, or both. This config example shows a good way
to do it

Received on Wed Oct 23 2013 - 06:34:19 MDT

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