IPv6 is properly resolving in DNS:
> host 2607:fa18:0:2::17 18.104.22.168.0.0.0.0.0.0.0.0.0.0.0.0.22.214.171.124.0.0.0.0.8.1.a.f.126.96.36.199.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?