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List:       squid-users
Subject:    Re: [squid-users] Basic load balancing with squid
From:       Henrik Nordstrom <hno () squid-cache ! org>
Date:       2005-09-29 12:48:45
Message-ID: Pine.LNX.4.61.0509291444150.8019 () localhost ! localdomain
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On Thu, 29 Sep 2005, Roberto Barbieri wrote:

> I need to setup a squid proxy which should balance outgoing traffic
> between two different internet connections.

This is best done by configuring the OS to route-balance the two links 
combined with policy routing to keep traffic bound to their selected link. 
The proxy will automatically benefit from the link balancing done by the 
OS.

I.e.

1. Configure policy routing routing traffic with a source IP of 
respective ISP out to that ISP no matter what. Most ADSL ISPs have 
filtering not allowing traffic with the "wrong" source IP on their link. 
If your ISPs does not have such filters then this step can be skipped, but 
I would recommend it in any case.

2. Configure the main default route to load balance between the two 
providers.


You can also play games with tcp_outgoing_address in squid.conf as an 
alternative to 2.

Regards
Henrik
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