IPv6 reverse not resolving for Linux shell "last" and "who"

Question

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?

`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 08 '13 at 15:16

score 1 · Answer 1 · answered Mar 08 '13 at 17:05

1

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

answered Mar 08 '13 at 17:05

Pete Ashdown

score 0 · Answer 2 · answered Mar 08 '13 at 14:57

0

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

answered Mar 08 '13 at 14:57

Sander Steffann

2 Answers2