6to4 source address causing Secondary DNS to ignore notify

IPv6 specific questions and discussion.

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6to4 source address causing Secondary DNS to ignore notify

Post by robnich » Sat Jul 31, 2010 1:24 pm

My server came by default with a 6to4 tunnel set up. Today I noticed this issue, but it's probably been around for a while, I assume since rollernet added ipv6 support?

My server notified the secondary DNS servers of a zone change, and got the ipv6 address for ns1.rollernet.us. It then connected using the 6to4 tunnel, which gave it a 2002: ipv6 address. Rollernet's server then ignored the notify because the 2002: address isn't a master.

It would seem to make sense for the secondary servers to see the 2002: address as equivalent to the corresponding ipv4 address, since this is only a mapping of the address.

I've solved the problem by disabling the 6to4 tunnel, and I'm working to get my HE 6tunnel addresses working. I used a hostname as the master server for my zones. If my master connects using ipv6 and the reverse DNS matches the hostname, will the secondary server still accept the notify?

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Re: 6to4 source address causing Secondary DNS to ignore noti

Post by Seth » Sat Jul 31, 2010 4:15 pm

The hostname is not used beyond doing an A record lookup before generating the config for BIND; it's impossible to define a master server by hostname. On the BIND side it's IP only, so your config was built with an IPv4 address only. A 6to4 address will work fine as long as it's listed.
Seth Mattinen, Roller Network LLC


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