[Bug 1836695] Re: Netplan ignores static routes when using DHCP

[Lars Erik Pedersen]

Hi. I did som further investigation here, and I think I've figured out
what happens in networkd here.

Aug 21 10:54:45 nettest1 systemd-networkd[5463]: ens3: Removing address: 2001:700:1d00:ec00:5054:ff:fe49:4bc9/64 (valid for 4w 2d)
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Removing address: 10.212.128.84/24 (valid for 11h 57min 54s)
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=17 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=18 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Routing policy rule configured
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Could not set route: Network is unreachable
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Routes set
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Adding address: 10.212.128.84/24 (valid for 12h)
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=19 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=20 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
Aug 21 10:54:46 nettest1 systemd-networkd[5463]: ens3: Configured

Basically it seems like networkd does the following on "netplan apply":
1) Remove every address
2) Add routes - which of course will fail with "network is unreachable" because the interfaces don't have an address yet
3) Adding the addresses

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https://bugs.launchpad.net/bugs/1836695

Title:
  Netplan ignores static routes when using DHCP

Status in netplan:
  Invalid
Status in systemd package in Ubuntu:
  New

Bug description:
  Consider the following setup:

  network:
    version: 2
    renderer: networkd
    ethernets:
      ens4:
        dhcp-identifier: mac
        dhcp4: yes
        dhcp4-overrides:
          use-dns: no
          use-ntp: no
          send-hostname: no
          use-hostname: no
          use-routes: no
        routes:
        - to: 10.0.0.0/8
          via: 10.50.0.1
        optional: true

  Thus I only need to get the IP address by DHCP, then add some static
  routes. This setup doesn't work. Apparently `routes` keyword only
  works when using static addresses.

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