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Their specification draft says they should on section 3.2.1. Are we there yet? Has anyone used Varnish with IPv6?

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http://www.varnish-cache.org/docs/2.1/reference/varnishd.html?highlight=ipv6 This is from the documentation of varnish, and answers your question: yes, varnish has IPv6 support.

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Varnish2 is not completely ipv6-ready, hardcoded IPs in the backend definition failed for me - ref varnish-cache.org/trac/ticket/832 - this has been fixed in varnish3 though. –  tobixen Jan 30 '13 at 11:35

Haven't tried it myself, but read of people using Varnish as a dual-stack front-end for an IPv4-only web server. So, it should be possible.

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