Open Infrastructure

Creating manually¶

Creating vxlans manually works in our networks:

[17:54:12] server2.place6:~# ip -6 link add vxlan4242 type vxlan id
4242 dstport 4789 local 2a0a:e5c0:2:1:21b:21ff:febb:68d8 group
ff05::4242 dev bond0.11 ttl 5

[18:07:33] server3.place6:~# ip -6 link add vxlan4242 type vxlan id 4242 dstport 4789 local 2a0a:e5c0:2:1:21b:21ff:febb:68f0 group ff05::4242 dev bond0.11 ttl 5

[18:08:05] server2.place6:~# ip addr add 2a0a:e5c0:5:2::2/64 dev vxlan4242
[18:09:44] server2.place6:~# ip l s vxlan4242 up

[18:07:33] server3.place6:~# ip -6 link add vxlan4242 type vxlan id 4242 dstport 4789 local 2a0a:e5c0:2:1:21b:21ff:febb:68f0 group ff05::4242 dev bond0.11 ttl 5
[18:08:04] server3.place6:~# ip addr add 2a0a:e5c0:5:2::3/64 dev vxlan4242
[18:09:40] server3.place6:~# ip l s vxlan4242 up
[18:09:49] server3.place6:~# ping 2a0a:e5c0:5:2::2
PING 2a0a:e5c0:5:2::2(2a0a:e5c0:5:2::2) 56 data bytes
64 bytes from 2a0a:e5c0:5:2::2: icmp_seq=1 ttl=64 time=0.570 ms
64 bytes from 2a0a:e5c0:5:2::2: icmp_seq=2 ttl=64 time=0.353 ms
^C
--- 2a0a:e5c0:5:2::2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1005ms
rtt min/avg/max/mdev = 0.353/0.461/0.570/0.110 ms
[18:09:54] server3.place6:~#

Created by opennebula¶

Creating vxlans with OpenNebula only makes them work on the same host. I assume that

• the group parameter may be wrong
• dstport might or might not be right

How to solve¶

• Read https://vincent.bernat.ch/en/blog/2017-vxlan-linux to understand how it is supposed to work
• Analyse /var/tmp/one/vnm/vxlan/vxlan.rb
• Create some vxlan networks (see Networking, prefix 2a0a:e5c0:5::/48 is usable) and debug opennebula behaviour
• Find out the difference between the networks created by opennebula and the manual version above
• Fix/patch vxlan.rb
• Add patch to cdist / overwrite until opennebula fixed it
• Submit patch to opennebula / github