ICP Emulation

[maillists0 at gmail.com]

An older blog post on the Varnish site says this:

"... you can emulate ICP-like behaviour by writing VCL code to check your
neighouring cache for the request that you are looking for. Setups like
these have been discussed on
varnish-misc<http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc/>several
times and implementing it should be fairly simple."

I must be searching the wrong terms, because I can't find any descriptions
of this.

It looks to me like the setup would be little more than setting the peer as
a backend and then setting req.hash_ignore_busy on one of the servers to
avoid race conditions, as described on the wiki. Is there anything I'm
missing, or does someone have a reference on how to set this up? Any help
is appreciated.
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