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IPv6 is properly resolving in DNS:

> host 2607:fa18:0:2::17 \
  domain name pointer

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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2 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

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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