Henrik Nordstrom wrote:
We have a similar setup, an cheap 5MBit-ADSL line for www and a "decent" line for everything else.On Tue, 26 Oct 2004, Daniel Fenert wrote:
I have two (for now) internet connections, one is exclusively for www usage,
and the other for everything else.
The problem is that 'www connection' hangs from time to time (usually once a
week). I would like to setup squid for failover operation (when one connection
dies, it should switch to other).
What is the best way to solve this problem?
Generally I would advice to solve it by routing. Monitor the link and when it goes down change the default gateway of the Squid proxy to the other, and when available again change it back.
Combine this with source routing to not crash existing connections when switching (some ISPs does not like seeing source addresses of another ISP from their customers..)
Regards Henrik
The ADSL-line is connected to a diskless memorycache-only squid box with a pppoe on the same (small) machine.
The user connect to another squid box. This machine is much bigger and uses a disk cache and is connected via the "everything else" line to the net.
The ADSL-squid is the default-parent for the squid the users connect to. Nearly all requests are forced over the parent but if the ADSL-squid fails all requests are fetched direct using the other line. Delay-pools are used to prevent overloading the remaining line.
No need to monitor a link, squid is switching over just fine on its own.
I think that chaining the proxies may add some latency, but we manage roughly 10GB a day with that setup.
Regards, Hendrik Voigtl�nder
