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On first machine:
root@jeff-VirtualBox-ubuntu-16:~# modprobe fou
root@jeff-VirtualBox-ubuntu-16:~# ip fou add port 55137 ipproto 4
root@jeff-VirtualBox-ubuntu-16:~# ip link add name fou0 type ipip remote 192.168.1.135 local 192.168.1.137 encap fou encap-sport 55137 encap-dport 55135 dev enp0s3
root@jeff-VirtualBox-ubuntu-16:~# ip link set up dev tunl0
root@jeff-VirtualBox-ubuntu-16:~# ip link set up dev fou0
root@jeff-VirtualBox-ubuntu-16:~# ip addr add 10.0.0.137/24 dev fou0
root@jeff-VirtualBox-ubuntu-16:~#
On second machine:
root@jeff-VirtualBox-ubuntu-16-2:~# modprobe fou
root@jeff-VirtualBox-ubuntu-16-2:~# ip fou add port 55135 ipproto 4
root@jeff-VirtualBox-ubuntu-16-2:~# ip link add name fou0 type ipip remote 192.168.1.137 local 192.168.1.135 encap fou encap-sport 55135 encap-dport 55137 dev enp0s3
root@jeff-VirtualBox-ubuntu-16-2:~# ip link set up dev tunl0
root@jeff-VirtualBox-ubuntu-16-2:~# ip link set up dev fou0
root@jeff-VirtualBox-ubuntu-16-2:~# ip addr add 10.0.0.135/24 dev fou0
root@jeff-VirtualBox-ubuntu-16-2:~#