Date: Tue, 12 Aug 2008 21:51:34 +0530 From: =?unknown-8bit?B?4KSG4KS24KWA4KS3IOCktuClgeCkleCljeCk?= =?unknown-8bit?Q?=B2?= Ashish Shukla <wahjava.ml@gmail.com> To: freebsd-stable@freebsd.org Subject: Re: neighbor discovery problem Message-ID: <20080812162134.GA2652@chateau.d.lf> In-Reply-To: <E1KSswq-000AcK-Bz@dilbert.ticketswitch.com> References: <6338C16505B9465ED4A9CA76@andromede.in.absolight.net> <E1KSswq-000AcK-Bz@dilbert.ticketswitch.com>
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[-- Attachment #1 --] In <E1KSswq-000AcK-Bz@dilbert.ticketswitch.com>, Pete French wrote: >> The network is pretty simple, >> >> gateway : >> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 >> options=b<RXCSUM,TXCSUM,VLAN_MTU> >> inet6 fe80::207:e9ff:fe0e:dead%em0 prefixlen 64 scopeid 0x1 >> inet6 2a01:678:1:443:: prefixlen 64 >> inet6 2a01:678:100:: prefixlen 48 > >Hmmm, are machine numbers of all zeroes legal in IPv6 ? I would >configure those as '2a01:678:1:443::1' and '2a01:678:100::1' if >I were you. All zeroes as a machine number is certainly a no-no in >IPv4, and I wouldn't use it in IPv6 either. I have no idea if it's >actually a problem, but it gives me a bad feeling.... Yes, it is legal, and such address, with subnet prefix + all zeroes in the host identifier (or interface identifier) is known as subnet-router anycast address. For further information, check out RFC 4291, Section 2.6.1[1]. References: [1] - http://tools.ietf.org/html/rfc4291#section-2.6.1 Ashish Shukla -- ·-- ·- ···· ·--- ·- ···- ·- ·--·-· --· -- ·- ·· ·-·· ·-·-·- -·-· --- -- [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) iEYEARECAAYFAkihuI4ACgkQHy+EEHYuXnRSzwCeMKaqabepIVh8ndktFkKD5/gC C4oAoOxqiZ2YbqZndt7qA92sNdR+BfbC =uJ35 -----END PGP SIGNATURE-----help
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