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From: Hartmut Figge <h.figge@gmx.de>
Subject: [gentoo-user] IPv4 & IPv6
Date: Sat, 28 Apr 2018 08:09:35 +0200
Organization: O:-)
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Greetings,

I do not know why my machine suddenly local uses IPv6 instead of IPv4. I
noticed it today when I was unable to retrieve mail. syslog now shows

xinetd[3763]: START: pop-3 from=::1
instead of the former
xinetd[3761]: START: pop-3 pid=22632 from=127.0.0.1

and 'telnet localhost pop3' fails unless I force IPv4 with
'telnet -4 localhost pop3'.

I was unable to find the place where I could change this behavior, so I
used a dirty trick.

----- /etc/hosts -----
# IPv4 and IPv6 localhost aliases
127.0.0.1 localhost
# ::1   localhost
---------------

Commenting out the last line helped and I could get my mails. But that
is really a dirty trick. *g*.

I have never used IPv6, I don't intend to and I have forgotten most of
what I may have known about the issue. Hopefully on of you knows the
right way.

Hartmut