Subj : Strange error To : Björn Felten From : Richard Menedetter Date : Sat Apr 30 2016 20:14:10 Hi Björn! 29 Apr 2016 00:36, from Björn Felten -> Kees van Eeten: KvE>> It only tells, that the reverse resolution was not successful, KvE>> which is quite common for IPv6 adresses. BF> Thanks. Yes, that's about what my investigation led to too. BF> Especially experimental ditto, I guess? BF> A minor glitch more than a severe error? You do not need to have a reverse name configured! That is not an error, it is just an info that reverse lookup failed, or delivered a different name. It takes the name, and looks up the IPv6 address. Then it tries to lookup what name is configured for the address. You do not need to make ANY reverse name entry. See below ... fido.ricsi.priv.at has different reverse lookups then the addresses for fido.ricsi.priv.at fido@odroid:~$ host fido.ricsi.priv.at fido.ricsi.priv.at has address 62.178.175.238 fido.ricsi.priv.at has IPv6 address 2001:6f8:1298:0:c022:9ff:fef2:5fe8 fido@odroid:~$ host 62.178.175.238 238.175.178.62.in-addr.arpa domain name pointer 62-178-175-238.cable.dynamic.surfer.at. fido@odroid:~$ host 2001:6f8:1298:0:c022:9ff:fef2:5fe8 8.e.f.5.2.f.e.f.f.f.9.0.2.2.0.c.0.0.0.0.8.9.2.1.8.f.6.0.1.0.0.2.ip6.arpa domain name pointer odroid.ricsi.priv.at. CU, Ricsi --- GoldED+/LNX * Origin: The only certainty is that nothing is certain (2:310/31) .