https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280701
--- Comment #31 from Franco Fichtner <[email protected]> ---
According to multiple users the ICMP patch series causes stalls in neighbor
discovery and only a full revert brings back the desired behaviour.
A TCP dump showed that the Cisco is sending ICMP6 neighbour solicitations,
which are answered by the opnsense with a large delay.
The cisco switch looses it's IPv6 neighbour.
tcpdump -n -i ix0 icmp6 and host fe80::86b8:2ff:fe1a:c67f
07:34:42.764553 IP6 fe80::86b8:2ff:fe1a:c67f > 2001:xxxx:x:x::x:2: ICMP6,
neighbor solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:43.852542 IP6 fe80::86b8:2ff:fe1a:c67f > 2001:xxxx:x:x::x:2: ICMP6,
neighbor solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:44.940525 IP6 fe80::86b8:2ff:fe1a:c67f > 2001:xxxx:x:x::x:2: ICMP6,
neighbor solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:46.094207 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:47.120778 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:48.201460 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:49.336747 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:50.360952 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:51.385618 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:52.436467 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:53.529962 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:54.617082 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:55.717592 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:56.765964 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:57.796680 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:58.888994 IP6 fe80::86b8:2ff:fe1a:c67f > ff02::1:ff56:2: ICMP6, neighbor
solicitation, who has 2001:xxxx:x:x::x:2, length 32
07:34:58.889051 IP6 fe80::3eec:efff:fe70:7326 > fe80::86b8:2ff:fe1a:c67f:
ICMP6, neighbor advertisement, tgt is 2001:xxxx:x:x::x:2, length 32
via: https://github.com/opnsense/src/issues/217
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