Re: ipv6 gateway on different subnet

[Tobias Nygren <tnn%NetBSD.org@localhost>]

Hi,

I'm not 100% sure it's the same problem but I have this patch that
works around the problem for me on a different provider.
Maybe there needs to be a sysctl to disable the non-neighbor check.

-Tobias

--- sys/netinet6/nd6_nbr.c	13 Nov 2024 09:25:52 -0000	1.185
+++ sys/netinet6/nd6_nbr.c	18 Jan 2025 18:41:30 -0000
@@ -161,12 +161,14 @@ nd6_ns_input(struct mbuf *m, int off, in
 		 * Make sure the source address is from a neighbor's address.
 		 */
 		sockaddr_in6_init(&ssin6, &saddr6, 0, 0, 0);
+#if 0
 		if (nd6_is_addr_neighbor(&ssin6, ifp) == 0) {
 			nd6log(LOG_INFO,
 			    "NS packet from non-neighbor %s on %s\n",
 			    IN6_PRINT(ip6buf, &saddr6), if_name(ifp));
 			goto bad;
 		}
+#endif
 	}

 	if (IN6_IS_ADDR_MULTICAST(&taddr6)) {