Date: Thu, 27 Mar 2014 17:23:55 +0100 From: Mikal Sande <mikal@sande.im> To: FreeBSD Net <freebsd-net@freebsd.org> Subject: ipv6 neighbor cache question Message-ID: <5334509B.8010706@sande.im>
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Is the IPv6 neighbor cache supposed to not inlcude incomplete entries? When my freebsd box resolves a previously unknown ipv6 address with ndp it does not add anything to the neighbor cache before it gets a reachability confirmation. I have viewed the neighbor cache with ndp -a. The ipv6 addresses in question are local, so I am pretty sure that on-link determination is not interfering. The same thing happens with both link-local and global addresses. When I ping an unused ipv6 address I do not find any corresponding incomplete entry in the neighbor cache afterwards. But, if I ping an unused ipv4 address i do find an incomplete entry in the arp cache. I am curious as to why this behavior occurs. Is it intentional? Is it by design? The reason for my curiosity is that I have not observed this behavior in other OSes such as linux and openbsd. My box is currently running. FreeBSD hostname 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 16 22:34:59 UTC 2014 root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 -- Mikal Sande
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