On 5/10/2018 8:08 PM, Ben Pfaff wrote:
On Thu, May 10, 2018 at 05:54:30PM -0700, Gregory Rose wrote:
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 for investigating.
Even if this isn't fixable out-of-tree, is it something for which we
should submit a fix so that future upstream releases don't have the same
limitation?
It's worth investigating. The way the kernel forces the ipv6 option
with geneve gives me reason to
believe that there are some dependencies that would need to be undone so
it's hard to say how
much work it would require.
Thanks,
- Greg
Thanks,
Ben.
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