[Bug 233683] IPv6 ND neighbor solicitation messages fail to arrive
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Date: Wed, 19 Jul 2023 14:00:08 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233683
Andrey V. Elsukov <ae@FreeBSD.org> changed:
What |Removed |Added
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CC| |ae@FreeBSD.org
--- Comment #15 from Andrey V. Elsukov <ae@FreeBSD.org> ---
I suspect the problem could be related to some multicast filtering bug in NIC
driver. E.g. recently there was this patch: https://reviews.freebsd.org/D40860
It looks most of Intel NICs have this limitation. And when you have many IPv6
addresses on the host, it is pretty easy overflow 128 entries. Usually when
such problem happens, enabling PPROMISC mode should help, since kernel will
receive all messages and filter them by self.
Also some drivers have ability to enable ALLMULTI mode, when NIC accepts all
multicast packets. Using this patch
https://people.freebsd.org/~ae/allmulti.diff you can enable this mode as
workaround.
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