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IPv6 is properly resolving in DNS:

> host 2607:fa18:0:2::17
7.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.0.0.0.0.0.8.1.a.f.7.0.6.2.ip6.arpa \
  domain name pointer sine.xmission.com.

However, the reverse DNS name isn't showing up properly via "last" and "who" on a Linux shell:

> who | grep pashdown
pashdown pts/17       2013-03-08 07:30 (2607:fa18:0:2::17)

Is there some switch I need to throw for Linux to start resolving IPv6 reverse for logins?

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sine.xmission.com does not have a AAAA forward record though. Some applications won't trust a PTR record unless there exists a forward record that matches it. I don't know whether or not that's the problem here. –  Celada Mar 8 '13 at 15:16
    
Bingo! Thanks for catching that. –  Pete Ashdown Mar 8 '13 at 17:03
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2 Answers

The "login" program needs forward as well as reverse in order to present the DNS name properly.

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This depends on each application. There is no global 'start resolving IPv6 reverse for logins' setting.

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