[Bug 1781652] Re: should be possible to specify static routes on a dhcp-configured interface

[Paweł Wojciechowski]

Adding ONLINK option to netplan is essential.

I have same problem.

systemd has GatewayOnlink option which can be used.
[Route]                                                                                                                                                                                        
Destination=10.1.0.0/16                                                                                                                                                                        
Gateway=10.5.0.1                                                                                                                                                                               
GatewayOnlink=true

I have changed Status to Confirmed (this whole case should be changed
from Bug to New feature).

** Changed in: systemd (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: netplan
       Status: New => Confirmed

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Title:
  should be possible to specify static routes on a dhcp-configured
  interface

Status in netplan:
  Confirmed
Status in systemd package in Ubuntu:
  Fix Released

Bug description:
  From <https://askubuntu.com/questions/1054572/netplan-is-there-an-
  equivalent-to-post-up>, a user wants to add a static route to a
  network interface where the gateway is known, but the interface's
  local address is configured via dhcp.

  This doesn't work with direct netplan yaml, because networkd will try
  to apply the static routes before the interface has been configured
  via dhcp, failing because there is not yet a route to the gateway on
  that interface.

  Demonstrating in a lxd container locally, which has 10.44.49.0/24 as
  its network:

  $ cat /etc/netplan/50-cloud-init.yaml
  # This file is generated from information provided by
  # the datasource.  Changes to it will not persist across an instance.
  # To disable cloud-init's network configuration capabilities, write a file
  # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
  # network: {config: disabled}
  network:
      version: 2
      ethernets:
          eth0:
              dhcp4: true
              routes:
                 - to: 10.44.48.0/24
                   via: 10.44.49.2
                   metric: 10
  $  systemctl status systemd-networkd --no-pager -l
  ● systemd-networkd.service - Network Service
     Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled; vendor preset: enabled)
     Active: active (running) since Fri 2018-07-13 19:21:29 UTC; 8min ago
       Docs: man:systemd-networkd.service(8)
   Main PID: 165 (systemd-network)
     Status: "Processing requests..."
      Tasks: 1 (limit: 4915)
     CGroup: /system.slice/systemd-networkd.service
             └─165 /lib/systemd/systemd-networkd

  Jul 13 19:21:29 stable-dane systemd[1]: Starting Network Service...
  Jul 13 19:21:29 stable-dane systemd-networkd[165]: Enumeration completed
  Jul 13 19:21:29 stable-dane systemd[1]: Started Network Service.
  Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Could not set route: Network is unreachable
  Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: DHCPv4 address 10.44.49.32/24 via 10.44.49.1
  Jul 13 19:21:29 stable-dane systemd-networkd[165]: Not connected to system bus, not setting hostname.
  Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Gained IPv6LL
  Jul 13 19:21:29 stable-dane systemd-networkd[165]: eth0: Configured
  Jul 13 19:21:55 stable-dane systemd-networkd[165]: Could not set hostname: Method call timed out
  $ ip route 
  default via 10.44.49.1 dev eth0 proto dhcp src 10.44.49.32 metric 100 
  10.44.49.0/24 dev eth0 proto kernel scope link src 10.44.49.32 
  10.44.49.1 dev eth0 proto dhcp scope link src 10.44.49.32 metric 100 
  $

  netplan and networkd should DTRT.

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