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[Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

** Changed in: linux (Ubuntu Xenial)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Eric Desrochers (slashd)

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https://bugs.launchpad.net/bugs/1771301

Title:
  Setting ipv6.disable=1 prevents both IPv4 and IPv6 socket opening for
  VXLAN tunnels

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  In Progress

Bug description:
  When booting with ipv6.disable=1, vxlan tunnels will fail to
  initialize with the error "vxlan: Cannot bind port 4789, err=-97"
  which is EAFNOSUPPORT.

  Expected result is that vxlan tunnels work when ipv6 is disabled.

  Description:	Ubuntu 16.04.4 LTS
  Release:	16.04

  linux-image-4.4.0-124-generic

  bug is fixed in RHEL in
  https://bugzilla.redhat.com/show_bug.cgi?id=1445054

  Steps to reproduce:

  Deploy two identical 14.04 nodes with the following configuration:

  Add the following to /etc/default/grub then run 'sudo update-grub'
  GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"

  Reboot both nodes
  sudo reboot

  Set up a tunnel using the following commands on each node modifying
  remote_ip to be the ip of the other node. modify veth0 ip to be subnet
  using the tunnel 10.10.10.x/24

  ovs-vsctl del-port br-int vx1
  ovs-vsctl del-port br-int veth1
  ip link del veth0

  ovs-vsctl add-port br-int vx1 -- set interface vx1 type=vxlan options:remote_ip=192.168.122.161
  # remote_ip should be the ip of the other node

  ip link add type veth
  ip link set veth0 up
  ip link set veth1 up
  ovs-vsctl add-port br-int veth1
  ip addr add 10.10.10.2/24 dev veth0 # on the second node use 10.10.10.3/24

  Expected result is once the tunnel is configured on each side, you
  should be able to ping the ip of veth0 on the remote side while ipv6
  is disabled.

  ping 10.10.10.2 or 10.10.10.3, whichever is the remote side.

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