Hi, Postfix fails to start up due to inability to deal with inet_interface = $myhostname resolving to (also) IPv6 link-local address(es):
postfix/postfix-script[1200]: starting the Postfix mail system postfix/master[1202]: fatal: bind fe80::20c:29ff:fec7:e39f port 25: Invalid argument postfix/master[1201]: fatal: daemon initialization failure -- see logs for details postfix/postfix-script[1203]: fatal: mail system startup failed Background story: Back in October 2024, Fedora Linux changed the /etc/nsswitch.conf setting for hosts to: hosts: files myhostname resolve [!UNAVAIL=return] dns This change moved the "myhostname" plugin before the "dns" lookup plugin in order to avoid doing actual DNS lookups for the machine's own hostname/FQDN: https://bugzilla.redhat.com/show_bug.cgi?id=2257197#c3 Unlike DNS, the nss-myhostname module returns all system addresses, also link-local: [dr@naboo ~]$ postconf inet_interfaces inet_interfaces = $myhostname [dr@naboo ~]$ postconf myhostname myhostname = naboo.cluenet.de [dr@naboo ~]$ getent ahosts naboo.cluenet.de fe80::20c:29ff:fec7:e39f%2 STREAM naboo.cluenet.de fe80::20c:29ff:fec7:e39f%2 DGRAM fe80::20c:29ff:fec7:e39f%2 RAW 2001:1440:201:3200::17 STREAM 2001:1440:201:3200::17 DGRAM 2001:1440:201:3200::17 RAW 195.20.121.17 STREAM 195.20.121.17 DGRAM 195.20.121.17 RAW When investigating, I found some discussion with nss-myhostname's author (L. Poettering) that seems to indicate that this behaviour is intentional. Debian ran into a similar problem around 2013 with their ping6, and Lennart (author of NSS myhostname) confirmed returning LL addresses is intentional: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=705900#128 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=705900#178 Postfix cannot deal with link-local according to the code in src/global/own_inet_addr.c I looked at. It doesn't expect link-local addresses get returned, has no provisions for dealing with address scopes so subsequent binding to those addresses fails due to missing address scope I guess. Best regards, Daniel _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
