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Sure, go ahead and close it if you see no interest in further discussion here. From my perspective everything has been said.

I already did:

https://github.com/NagiosEnterprises/nrpe/issues/31

It didn't stir much interest so far:

tilmanschmidt opened this Issue 5 days ago · 0 comments

But thanks for reminding me I should update it with my latest findings and a link to the discussion here.

Ah, sorry, I forgot to mention that. Specifying the numeric addresses, ie.
works fine.

JFTR, NRPE version 2.15 added IPv6 support. I've opened a new subject for the first problem I've encountered with that.

A fully IPv6 dual stack enabled network is monitored by Nagios 3.5.1 installed from EPEL on a CentOS 6.7 server. Monitored hosts run NRPE agents, all of which are configured to run as daemons (not via xinetd) with the configuration line allowed_hosts=bombur.example.com where bombur.example.com is th...

Thanks. I was aware of those two efforts, but somewhat unsure regarding their status.
It makes me a bit nervous that none of them has made it into the main development branch.
There must be a reason for that.

Is any of them ready for use in a production environment?

It seems that although Nagios itself does of course support IPv6, the NRPE plugin check_nrpe does not: [ts@bombur ~]$ host galadriel.example.com galadriel.example.com has IPv6 address 2001:db8:f004:8::32 [ts@bombur ~]$ /usr/lib64/nagios/plugins/check_nrpe -n -H galadriel.example.com Invalid host nam...