When configured with ACCEPT_RTADV, the eqos NIC in the RK3566 does not receive packets addressed to 33:33:00:00:00:01 and therefore does not see NDP packets needed to participate in IPv6. Explicitly placing the NIC in promiscuous mode (e.g. using tcpdump) works. Using mtest(8) to add and remove 33:33:00:00:00:01 shows that the address appears to be configured in the NIC but packets addressed to that MAC aren't getting passed into the kernel (not seen by tcpdump).
I've created https://reviews.freebsd.org/D47115 with a fix.
A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=bf8d4cfe347b34a9ca21e2cdab5f9bba09be73bf commit bf8d4cfe347b34a9ca21e2cdab5f9bba09be73bf Author: Peter Jeremy <peterj@FreeBSD.org> AuthorDate: 2024-10-16 07:20:30 +0000 Commit: Peter Jeremy <peterj@FreeBSD.org> CommitDate: 2024-10-16 07:20:30 +0000 eqos: Fix group address filtering. The hash filter table order in the GMAC matches the order of the top bit of the hashed destination address. See the description of GMAC_MAC_Hash_table_Reg0 in RK3568 TRM part 2, section 20.4.2. PR: 282074 Reviewed by: manu MFC after: 7 days Differential Revision: https://reviews.freebsd.org/D47115 sys/dev/eqos/if_eqos.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)