[Bug 1812680] Re: gre tunnels are down after netplan apply

[Lukas Märdian]

Ubuntu Bionic (which contained v0.97 and v0.98) are out of standard
support, and I cannot reproduce this issue on Ubuntu Focal (Netplan
v0.104) anymore. So I'm closing this bug report.

Please re-open if you think this is still an issue.

root at ff:~# cat /etc/netplan/tunnels-lp1812680.yaml 
network:
  version: 2
  renderer: networkd
  tunnels:
    tun0:
      mode: gre
      local: 1.1.1.1
      remote: 2.2.2.2
      addresses:
        - 10.7.10.50/30
    tun1:
      mode: gre
      local: 3.3.3.3
      remote: 4.4.4.4
      addresses:
        - 10.7.10.54/30
root at ff:~# netplan apply
root at ff:~# cat /run/systemd/network/10-netplan-tun0*
[NetDev]
Name=tun0
Kind=gre

[Tunnel]
Independent=true
Local=1.1.1.1
Remote=2.2.2.2
[Match]
Name=tun0

[Network]
LinkLocalAddressing=ipv6
Address=10.7.10.50/30
ConfigureWithoutCarrier=yes


root at ff:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: gre0 at NONE: <NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
    link/gre 0.0.0.0 brd 0.0.0.0
3: gretap0 at NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
4: erspan0 at NONE: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
5: tun0 at NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN group default qlen 1000
    link/gre 1.1.1.1 peer 2.2.2.2
    inet 10.7.10.50/30 brd 10.7.10.51 scope global tun0
       valid_lft forever preferred_lft forever
6: tun1 at NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN group default qlen 1000
    link/gre 3.3.3.3 peer 4.4.4.4
    inet 10.7.10.54/30 brd 10.7.10.55 scope global tun1
       valid_lft forever preferred_lft forever
586: eth0 at if587: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:16:3e:67:65:fb brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 10.238.94.77/24 metric 100 brd 10.238.94.255 scope global dynamic eth0
       valid_lft 3598sec preferred_lft 3598sec
    inet6 fd42:7213:f20e:bd74:216:3eff:fe67:65fb/64 scope global tentative mngtmpaddr noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::216:3eff:fe67:65fb/64 scope link 
       valid_lft forever preferred_lft forever

=> Tunnels end up in "UP,LOWER_UP" state

** Changed in: netplan.io (Ubuntu)
       Status: Confirmed => Won't Fix

** No longer affects: netplan

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https://bugs.launchpad.net/bugs/1812680

Title:
  gre tunnels are down after netplan apply

Status in netplan.io package in Ubuntu:
  Won't Fix

Bug description:
  After configuring gre tunnels via netplan the tunX devices are in the
  state down. I need to manually bring them up in order to have
  connectivity with another end of the tunnel.

  Netplan file:

  network:
    version: 2
    renderer: networkd
    tunnels:
      tun0:
        mode: gre
        local: 1.1.1.1
        remote: 2.2.2.2
        addresses:
          - 10.7.10.50/30
      tun1:
        mode: gre
        local: 3.3.3.3
        remote: 4.4.4.4
        addresses:
          - 10.7.10.54/30

  
  Output of ip a:
  16: tun1 at NONE: <POINTOPOINT,NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
      link/gre 1.1.1.1 peer 2.2.2.2
      inet 10.7.10.54/30 brd 10.7.10.55 scope global tun1
         valid_lft forever preferred_lft forever
  17: tun0 at NONE: <POINTOPOINT,NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
      link/gre 3.3.3.3 peer 4.4.4.4
      inet 10.7.10.50/30 brd 10.7.10.51 scope global tun0
         valid_lft forever preferred_lft forever

  
  Netplan version: 0.95-1
  Systemd: 237

  Networkd config files:
   cat 10-netplan-tun0*
  [NetDev]
  Name=tun0
  Kind=gre

  [Tunnel]
  Independent=true
  Local=1.1.1.1
  Remote=2.2.2.2

  [Match]
  Name=tun0

  [Network]
  LinkLocalAddressing=ipv6
  Address=10.7.10.50/30
  ConfigureWithoutCarrier=yes

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