[Bug 1743200] [NEW] No virtual interfaces

[Maciej Dems]

Public bug reported:

In the old /etc/network/interfaces I could define a virtual interface:

    auto eth0
    iface eth0 inet static
        address aaa.aaa.aaa.aaa
        netmask 255.255.255.0
        gateway aaa.aaa.aaa.1

    auto eth0:0
    iface enp7s0f0:0 inet static
        address bbb.bbb.bbb.bbb
        netmask 255.255.255.0

This is not possible to achieve with the netplan. The only exisiting
posibilities are either to create a VLAN, which may be not an option in
some networks where you have no access to other hosts, or to define both
addresses for one interface:

    network:
      version: 2
      renderer: networkd
      ethernets:
        eth0:
          addresses: [aaa.aaa.aaa.aaa/24, bbb.bbb.bbb/24]
          gateway4: aaa.aaa.aaa.1

This solution is not optimal either, because configuring iptables or
some services may require specific interface name for a single network.

It should be possible to add the same physical interfaces with different
networks and different alias names.

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

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https://bugs.launchpad.net/bugs/1743200

Title:
  No virtual interfaces

Status in nplan package in Ubuntu:
  New

Bug description:
  In the old /etc/network/interfaces I could define a virtual interface:

      auto eth0
      iface eth0 inet static
          address aaa.aaa.aaa.aaa
          netmask 255.255.255.0
          gateway aaa.aaa.aaa.1

      auto eth0:0
      iface enp7s0f0:0 inet static
          address bbb.bbb.bbb.bbb
          netmask 255.255.255.0

  This is not possible to achieve with the netplan. The only exisiting
  posibilities are either to create a VLAN, which may be not an option
  in some networks where you have no access to other hosts, or to define
  both addresses for one interface:

      network:
        version: 2
        renderer: networkd
        ethernets:
          eth0:
            addresses: [aaa.aaa.aaa.aaa/24, bbb.bbb.bbb/24]
            gateway4: aaa.aaa.aaa.1

  This solution is not optimal either, because configuring iptables or
  some services may require specific interface name for a single
  network.

  It should be possible to add the same physical interfaces with
  different networks and different alias names.

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