[Bug 1759014] [NEW] Netplan has no way to control DHCP client

[Alan Johnson]

Public bug reported:

Currently DHCP appears to be an all or nothing boolean, which is
insufficient for many network configurations.

Ideally all of the DHCP configuration options supported by systemd would also be supported in netplan:
https://www.freedesktop.org/software/systemd/man/systemd.network.html#%5BDHCP%5D%20Section%20Options


As an example, consider the following netplan configuration:

network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s3:
      dhcp4: yes
      nameservers: [8.8.8.8,8.8.4.4]


After running netplan apply I check the nameservers with systemd-resolve --status and it shows:

DNS Servers: 8.8.8.8
             8.8.4.4
             192.168.1.1

Here, "192.168.1.1" was provided by my DHCP server.  On this particular
node, I only want the manually configured DNS servers, but netplan has
no way to indicate this.

** Affects: nplan (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1759014

Title:
  Netplan has no way to control DHCP client

Status in nplan package in Ubuntu:
  New

Bug description:
  Currently DHCP appears to be an all or nothing boolean, which is
  insufficient for many network configurations.

  Ideally all of the DHCP configuration options supported by systemd would also be supported in netplan:
  https://www.freedesktop.org/software/systemd/man/systemd.network.html#%5BDHCP%5D%20Section%20Options


  As an example, consider the following netplan configuration:

  network:
    version: 2
    renderer: networkd
    ethernets:
      enp0s3:
        dhcp4: yes
        nameservers: [8.8.8.8,8.8.4.4]

  
  After running netplan apply I check the nameservers with systemd-resolve --status and it shows:

  DNS Servers: 8.8.8.8
               8.8.4.4
               192.168.1.1

  Here, "192.168.1.1" was provided by my DHCP server.  On this
  particular node, I only want the manually configured DNS servers, but
  netplan has no way to indicate this.

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