[ovs-discuss] IPv4/ IPv6 GRE tunnels

Arnold Bechtoldt mail at arnoldbechtoldt.com
Tue Nov 11 20:57:47 UTC 2014


Dear list,

I need to setup IPv6 connectivity in a OpenNebula setup using OVS
2.1.2-1 (via datapath-dkms) on Debian wheezy systems.

There are three compute nodes connected via GRE tunnels to each other to
provide inter-host connectivity for virtual machines attached to bridges
with 802.1Q VLANs.

This works great for IPv4. And for IPv6 on L2 bridges routed via ISP's
IPv6 default gateway, too.

Unfortunately hosts can't communicate each other via IPv6 in a vlan.
Which steps are necessary to get them together? Can I use existing IPv4
GRE tunnel(s) to encapsulate IPv6 traffic? Do I need dedicated IPv6 GRE
tunnels? Can I find more documentation regarding Open vSwitch, GRE and
IPv6 on the Net?

Thank you in advance!


Arnold


==========
# uname -a
Linux hpm1000 3.2.0-4-amd64 #1 SMP Debian 3.2.63-2+deb7u1 x86_64 GNU/Linux


# ovs-vsctl show
    Bridge "br0"
        Port "vnet52"
            Interface "vnet52"
...
        Port "eth0"
            Interface "eth0"
        Port "br0"
            Interface "br0"
                type: internal
    Bridge "br1"
        Port "vnet40"
            tag: 11
            Interface "vnet40"
        Port "vnet3"
            tag: 10
            Interface "vnet3"
...
        Port "gre2"
            Interface "gre2"
                type: gre
                options: {remote_ip="172.16.0.13"}
        Port "br1"
            Interface "br1"
                type: internal
        Port "vif0"
            tag: 10
            Interface "vif0"
                type: internal

        Port "gre1"
            Interface "gre1"
                type: gre
                options: {remote_ip="172.16.0.12"}
    Bridge "br2"
        Port "eth1"
            Interface "eth1"
        Port "br2"
            Interface "br2"
                type: internal
    ovs_version: "2.1.2"


# ip l | grep eth1
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP
mode DEFAULT qlen 1000
==========


-- 
Arnold Bechtoldt

Karlsruhe, Germany
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