[Bug 270859] dmesg message: mce0: a looped back NS message is detected during DAD
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Date: Sat, 13 May 2023 18:41:06 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270859
Hans Petter Selasky <hselasky@FreeBSD.org> changed:
What |Removed |Added
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CC| |hselasky@FreeBSD.org
--- Comment #3 from Hans Petter Selasky <hselasky@FreeBSD.org> ---
Hi,
The prints are related to IPv6 handling.
What is the state of the following sysctls:
sys/dev/mlx5/mlx5_en/en.h: m(+1, u64, mc_local_lb, "mc_local_lb", "0: Local
multicast loopback enabled 1: Disabled") \
sys/dev/mlx5/mlx5_en/en.h: m(+1, u64, uc_local_lb, "uc_local_lb", "0: Local
unicast loopback enabled 1: Disabled") \
There is a feature in the NIC to loopback the certain packets, confusing the
IPv6 stack in FreeBSD. This setting may also be in the hypervisor, and not the
VM.
That's my best guess for the culpit of this issue.
Sorry for late answer.
--HPS
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