[Kea-users] extra port and startup trouble with dhcp6

[Michael Agbaglo]

after a reboot the system (Fedora 35) comes up like this:

# ss -tulpn | grep kea
udp   UNCONN 0      0                                 0.0.0.0:44267      0.0.0.0:*    users:(("kea-dhcp6",pid=734,fd=16))
udp   UNCONN 0      0                               127.0.0.1:53001      0.0.0.0:*    users:(("kea-dhcp-ddns",pid=728,fd=10))
udp   UNCONN 0      0                                 0.0.0.0:45047      0.0.0.0:*    users:(("kea-dhcp4",pid=731,fd=16))
udp   UNCONN 0      0                               10.0.0.10:67         0.0.0.0:*    users:(("kea-dhcp4",pid=731,fd=19))


after restarting kea-dhcp6 it looks like this:

# ss -tulpn | grep kea
udp   UNCONN 0      0                               127.0.0.1:53001      0.0.0.0:*    users:(("kea-dhcp-ddns",pid=728,fd=10))
udp   UNCONN 0      0                                 0.0.0.0:59344      0.0.0.0:*    users:(("kea-dhcp6",pid=1463,fd=16))
udp   UNCONN 0      0                                 0.0.0.0:45047      0.0.0.0:*    users:(("kea-dhcp4",pid=731,fd=16))
udp   UNCONN 0      0                               10.0.0.10:67         0.0.0.0:*    users:(("kea-dhcp4",pid=731,fd=19))
udp   UNCONN 0      0                              [fd00::10]:547           [::]:*    users:(("kea-dhcp6",pid=1463,fd=19))
udp   UNCONN 0      0      [fe80::71aa:aab2:a98a:445c]%enp1s0:547           [::]:*    users:(("kea-dhcp6",pid=1463,fd=20))
udp   UNCONN 0      0                      [ff02::1:2]%enp1s0:547           [::]:*    users:(("kea-dhcp6",pid=1463,fd=21))


# kea-dhcp4 -V
2.0.2
tarball
linked with:
log4cplus 2.0.5
OpenSSL 1.1.1n  FIPS 15 Mar 2022
database:
MySQL backend 12.0, library 10.5.5
PostgreSQL backend 6.2, library 130004
Memfile backend 2.1

# kea-dhcp6 -V
2.0.2
tarball
linked with:
log4cplus 2.0.5
OpenSSL 1.1.1n  FIPS 15 Mar 2022
database:
MySQL backend 12.0, library 10.5.5
PostgreSQL backend 6.2, library 130004
Memfile backend 2.1

- What are the extra ports - beyond 67 and 547 - good for?
- Why does kea-dhcp6 always need a restart?
- Why does kea-dhcp6 bind to [ff02::1:2] if it is configured to get requests via a dhcp relay?