Comment 5 for bug 1999827

reproduction step further.

0. deploy machine for maas. ( in my case, virtual machine )
1. deploy maas
- sudo snap install maas
- setup maas-test-db
- setup admin

2. ssh into the machine
- ip a
ens4f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    ...
    inet 10.0.0.55/24 brd 10.0.0.255 scope global ens4f0
       valid_lft forever preferred_lft forever
- cat /var/snap/maas/current/bind/zone.0.0.10.in-addr.arpa
...
@ 30 IN NS maas.
55 30 IN PTR node-20.maas.

3. add additional ip to ens4f0
- sudo ip a a 10.0.0.100 dev ens4f0
- ip a
ens4f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:97:25:20 brd ff:ff:ff:ff:ff:ff
    altname enp0s4f0
    inet 10.0.0.55/24 brd 10.0.0.255 scope global ens4f0
       valid_lft forever preferred_lft forever
    inet 10.0.0.100/32 scope global ens4f0
       valid_lft forever preferred_lft forever

4. few mins later
- cat /var/snap/maas/current/bind/zone.0.0.10.in-addr.arpa
...
100 30 IN PTR node-20.maas.
55 30 IN PTR ens4f0.node-20.maas.