[Bug 293136] net.route.hash_outbound not automatically enabled for locally originated traffic over multipath ECMP routes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293136

Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> changed:

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--- Comment #1 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
Created attachment 268003
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268003&action=edit
patch_v12.diff

Thank you for the investigation and for reporting the issue officially!

As we were previously discussing on IRC, this will never be a problem if kernel
is built with options RSS, so probably either people who need and use ECMP run
FreeBSD with such kernels, or people don't use ECMP at all.

I spent some time chasing this problem and found that the multipath routes
installed by BIRD bypass the current logic, leaving outbound hashing disabled.

Please try the attached patch; it's probably the same one we discussed on IRC,
but it gained a bit of polishing.

We definitely need melifaro@ to take a closer look at this problem.

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