[Bug 1793189] Re: "netplan apply" does not apply changes to netmask when CIDR notation modified on static IP

[Lukas Märdian]

I cannot reproduce this with Netplan 0.99 on Bionic. Please re-open if
this is still an issue for you.

root at bb:~# cat /etc/netplan/50-cloud-init.yaml 
network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            addresses: [10.10.10.23/23]
root at bb:~# netplan apply
root at bb:~# ip a show dev eth0
88: eth0 at if89: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:16:3e:bd:da:7d brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 10.10.10.23/23 brd 10.10.11.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 10.238.94.182/24 brd 10.238.94.255 scope global dynamic eth0
       valid_lft 3591sec preferred_lft 3591sec
    inet6 fd42:7213:f20e:bd74:216:3eff:febd:da7d/64 scope global mngtmpaddr noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::216:3eff:febd:da7d/64 scope link 
       valid_lft forever preferred_lft forever

root at bb:~# vim /etc/netplan/50-cloud-init.yaml
root at bb:~# cat /etc/netplan/50-cloud-init.yaml 
network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            addresses: [10.10.10.23/24]
root at bb:~# netplan apply
root at bb:~# ip a show dev eth0
88: eth0 at if89: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:16:3e:bd:da:7d brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 10.10.10.23/24 brd 10.10.10.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 10.238.94.182/24 brd 10.238.94.255 scope global dynamic eth0
       valid_lft 3595sec preferred_lft 3595sec
    inet6 fd42:7213:f20e:bd74:216:3eff:febd:da7d/64 scope global mngtmpaddr noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::216:3eff:febd:da7d/64 scope link 
       valid_lft forever preferred_lft forever

** Changed in: netplan.io (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1793189

Title:
  "netplan apply" does not apply changes to netmask when CIDR notation
  modified on static IP

Status in netplan.io package in Ubuntu:
  Invalid

Bug description:
  So, somebody who hadn't had enough coffee one morning typoed the CIDR
  notation in /etc/netplan/01-netcfg.yaml on their server, resulting in
  the wrong netmask for the static IP. I corrected the CIDR notation,
  but "netplan apply" would not pick up the new info and update the
  netmask. Tested across four servers running 18.04 and same behavior
  occurred; required a reboot to get them to pick up the changed netmask
  info.

  Thanks!
  -Suzanne

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