ICMPv6 "too-big" packets ignored (filtered ?) by Cloudflare farms

Tue Mar 5 16:08:59 UTC 2019

Stephen Satchell <list at satchell.net> writes:

> On 3/5/19 2:54 AM, Thomas Bellman wrote:
>> Out of curiosity, which operating systems put anything useful (for use
>> in ECMP) into the flow label of IPv6 packets?  At the moment, I only
>> have access to CentOS 6 and CentOS 7 machines, and both of them set the
>> flow label to zero for all traffic.
>
> Did you submit a bug report?

I believe this was fixed 5 years ago (in Linux v3.17):
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cb1ce2ef387b01686469487edd45994872d52d73

But RHEL and CentOS are using kernels from the stone age, so they
haven't noticed yet.

Bjørn