On 5/1/2018 6:53 PM, Ben Pfaff wrote:
Hi Greg.
We've had multiple reports now that Geneve kernel-based tunnels do not
work in Open vSwitch if IPv6 is not enabled. Do you have an idea
whether we should consider this a bug in OVS or a bug in the
documentation? That is, should we plan to fix it (when we can) or
should we plan to document that Geneve requires IPv6? (Or is something
else going on?)
No rush.
Thanks,
Ben.
Sorry for the late response. It is just how the Linux kernel is
configured. There was an internal bug
filed a few months ago where I found that geneve depends on a certain
kernel configuration that
cannot be overridden and disabling ipv6 causes the check for the
configuration to always fail.
The upshot is that there is no fix without making changes to the
upstream Linux kernel. It is a Linux
kernel limitation and should probably be documented as you say, i.e.
"Geneve requires ipv6".
Thanks,
- Greg
On Mon, Apr 30, 2018 at 10:25:06AM +0200, Matthias May wrote:
On 27/04/18 14:20, Paul Greenberg wrote:
When IPv6 is disables in `/boot/grub2/grub.cfg`:
```
linux16 ... ipv6.disable=1
```
Then GENEVE interface does not come up properly.
```
# ovs-vsctl show
Port "ovn-14a54f-0"
Interface "ovn-14a54f-0"
type: geneve
options: {csum="true", key=flow, remote_ip="10.10.10.10"}
error: "could not add network device ovn-14a54f-0 to ofproto
(Address family not supported by protocol)"
```
Additionally, run the following commands:
```
# cat /proc/version
Linux version 3.10.0-514.21.1.el7.x86_64
(mockbu...@x86-020.build.eng.bos.redhat.com) (gcc version 4.8.5 20150623 (Red
Hat 4.8.5-11) (GCC) ) #1 SMP Sat Apr 22 02:41:35 EDT 2017
# ovs-vswitchd --version
ovs-vswitchd (Open vSwitch) 2.9.0
```
When IPv6 is enabled, then OVN works properly.
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Hi
I remember running into the same when playing around with GRE on a system where
IPv6 was disabled.
BR
Matthias
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