[Bug 1860781] [NEW] netplan networkd - bridge configuration not work

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Ubuntu: 18.04.3 LTS bionic

Kernel: 4.15.0-70-generic


1. configure network bridge with brctl with following commands and all
works fine:

sudo brctl addbr br-ex
sudo brctl addif br-ex enp0s3
sudo ip link set mtu 1500 dev br-ex
sudo ip addr del 10.64.10.100/24 brd 10.64.10.255 dev enp0s3
sudo ip addr replace 10.64.10.100/24 brd 10.64.10.255 dev br-ex
sudo ip link set br-ex up
sudo ip -f inet r replace default via 10.64.10.1 dev br-ex


2. configure the same network bridge with netplan and NetworkManager as renderer with following config all works fine:

network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enp0s3:
      dhcp4: no
      dhcp6: no
  bridges:
    br-ex:
      interfaces: [enp0s3]
      addresses: [10.64.10.100/24]
      gateway4: 10.64.10.1
      mtu: 1500
      nameservers:
        addresses: [8.8.8.8]
      dhcp4: no
      dhcp6: no
      parameters:
        stp: no


3. Configure network bridge with same config but with networkd as network renderer does not work
networkctl - shows that interfaces are managed by networkd and its ok
ip a - shows proper bridge configuration and ip address assignment
ip route - shows proper route via 10.64.10.1 and br-ex dev
No any error messages in systemd-networkd service log
But network don't work
I can't ping external hosts from this machine or ping this machine from external host 
 
  network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s3:
      dhcp4: no
      dhcp6: no
  bridges:
    br-ex:
      interfaces: [enp0s3]
      addresses: [10.64.10.100/24]
      gateway4: 10.64.10.1
      mtu: 1500
      nameservers:
        addresses: [8.8.8.8]
      dhcp4: no
      dhcp6: no
      parameters:
        stp: no


Can it be that i mislead some required by networkd configuration parameter?
Or may be networkd does not set some kernel parameter which brctl and NetworkManager does?

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment netplan networkd systemd-networkd
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netplan networkd - bridge configuration not work
https://bugs.launchpad.net/bugs/1860781
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