If I make a comment from an ipv4 address I see the commenter's ipv4 address logged in the comment file.
If I make a comment from an ipv6 address I see nothing.
There is a sanity check in /usr/share/perl5/IkiWiki/Plugin/comments.pm line 447 (according to today's version) there is an ipv4 specific regexp.
I removed the regexp and used the value without this added check and it fixed the problem for me. Not sure if this is the best solution. --cstamas
Thank you! --cstamas