Dual stack Apache

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http://askubuntu.com – I have an Ubuntu 12.04 server with a number of IPv4 addresses and a /64 of IPv6 addresses. I have it responding to its IPv6 addresses with ping6. I'd like the domains hosted on the server to go dual-stack, so IPv6-enabled visitors will be able to access its sites over IPv6, and everyone else will use IPv4. Here's the relevant parts of my Apache config as it stands now: ports.conf: NameVirtualHost Listen Listen [2607:ff50:0:21::2]:80 httpd.conf: <VirtualHost> ServerName cdc.nexussl.net DirectoryIndex index.php Docum (HowTos)