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Re: One squid instance, two WAN links, how to failover from primary to secondary link?

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On 27/08/2013 5:09 a.m., Thomas Harold wrote:
On 8/26/2013 6:41 AM, Nishant Sharma wrote:
Hi Thomas,

Thomas Harold <thomas-lists@xxxxxxxxxx> wrote:
In an instance where you have a single instance of squid running on a two WAN links as WAN
#2
is very slow compared to WAN #1.

Is this simply handled by changing the default gateway of the server
using the "ip route" commands when we detect that WAN#1 is down?

Yes, it should work that way. Simple and easy.


I'm guessing that "balance_on_multiple_ip" should be set to "off" as well, to keep squid from balancing across both WAN links?

balance_on_multiple_ip has nothign to do with Squid and WAN links. It is "balancing" requests over the different remote IPs when a website lists more than 1 IP in its DNS results.
Otherwise known as "client-based load balancing".


http://www.squid-cache.org/Doc/config/balance_on_multiple_ip/

It's not clear what the manual means when it says "Modern IP resolvers in Squid sort lookup results by preferred access. By default Squid will use these IP in order and only rotates to the next listed when the most preffered fails."

What is "preferred access"? Is that defined somewhere? Or does that mean the preferred routes defined by the TCP/IP network stack?

http://www.squid-cache.org/Doc/config/dns_v4_first/

Amos




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