[Bug 1930738] Re: network configuration failed on reboot

[Dan Streetman]

i can't reproduce this, and your log output looks like you have are
having problems with your ipv6 configuration, not ipv4. you'll need to
attach the full journal log if you still have this problem

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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Title:
  network configuration failed on reboot

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  This issue was reported at
  https://github.com/systemd/systemd/issues/17012

  **Used distribution**
   > Ubuntu 20.04.1 LTS

  
  **systemd version the issue has been seen with**
  > 245.4-4ubuntu3.2

  **Issue details**
  I configured 255 IPv4 address (including primary IP) using netplan but when the server restart, it time out on configuring the interface.  If I limit total IPv4 addresses to 181 or less, it works. But anything larger than 181 fails.

  Below are my configurations and error logs.

  **/etc/netplan/10-ens3.yaml**
  ```
  network:
    version: 2
    renderer: networkd
    ethernets:
      ens3:
        dhcp4: no
        addresses:
          - 140.XX.XX.XX/23
          - 103.XXX.XX.1/24
          - 103.XXX.XX.2/24
          - CONTINUED IP ADDRESS UPTO BELOW ...
          - 103.XXX.XX.254/24
        gateway4: 140.XX.XX.X
        nameservers:
          addresses: [1.1.1.1, 1.0.0.1]
        routes:
          - to: 169.254.0.0/16
            via: 140.XX.XX.X
            metric: 100
  ```
  The above config works if I run `netplan apply` but when I reboot, it does not work.

  **networkctl**
  ```
  IDX LINK TYPE     OPERATIONAL SETUP    
    1 lo   loopback carrier     unmanaged
    2 ens3 ether    routable    failed   

  2 links listed.
  ```

  **/etc/systemd/system/systemd-networkd.service.d/override.conf**
  ```
  [Service]
  Environment=SYSTEMD_LOG_LEVEL=debug
  ```

  **systemctl status systemd-networkd.service**
  ```
  ● systemd-networkd.service - Network Service
       Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled-runtime; vendor preset: enabled)
      Drop-In: /etc/systemd/system/systemd-networkd.service.d
               └─override.conf
       Active: active (running) since Thu 2020-09-10 19:46:58 UTC; 1min 36s ago
         Docs: man:systemd-networkd.service(8)
     Main PID: 346 (systemd-network)
       Status: "Processing requests..."
        Tasks: 1 (limit: 1074)
       Memory: 3.8M
       CGroup: /system.slice/systemd-networkd.service
               └─346 /lib/systemd/systemd-networkd

  Sep 10 19:47:03 test-server systemd-networkd[346]: NDISC: Sent Router Solicitation, next solicitation in 7s
  Sep 10 19:47:11 test-server systemd-networkd[346]: NDISC: No RA received before link confirmation timeout
  Sep 10 19:47:11 test-server systemd-networkd[346]: NDISC: Invoking callback for 'timeout' event.
  Sep 10 19:47:11 test-server systemd-networkd[346]: NDISC: Sent Router Solicitation, next solicitation in 15s
  Sep 10 19:47:23 test-server systemd-networkd[346]: Assertion 'm->sealed' failed at src/libsystemd/sd-netlink/netlink-message.c:582, function netlink_message_read_internal(). Ignoring.
  Sep 10 19:47:23 test-server systemd-networkd[346]: ens3: Could not set address: Connection timed out
  Sep 10 19:47:23 test-server systemd-networkd[346]: ens3: Failed
  Sep 10 19:47:23 test-server systemd-networkd[346]: ens3: State changed: configuring -> failed
  Sep 10 19:47:23 test-server systemd-networkd[346]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/network1/link/_32 interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=13 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a
  Sep 10 19:47:23 test-server systemd-networkd[346]: NDISC: Stopping IPv6 Router Solicitation client
  ```

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