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From: Mika Liljeberg <mika.liljeberg@welho.com>
To: CaT <cat@zip.com.au>
Cc: yoshfuji@linux-ipv6.org, linux-kernel@vger.kernel.org,
	netdev@oss.sgi.com, pekkas@netcore.fi
Subject: Re: 2.4.21+ - IPv6 over IPv4 tunneling b0rked
Date: 11 Jul 2003 03:04:29 +0300	[thread overview]
Message-ID: <1057881869.3588.10.camel@hades> (raw)
In-Reply-To: <20030710233931.GG1722@zip.com.au>

On Fri, 2003-07-11 at 02:39, CaT wrote:
> And having remembered /127 being mentioned as bad I changed the
> interface config to a netmask of /64. Dropped it and brought it
> up and it all works.
> 
> There's something fundamental about ipv6 netmasks that I just don't
> understand...

Well, the thing is that prefix:: is a special anycast address that
identifies a router on the link prefix::/n, where n is the prefix
length. You had configured a 127-bit link prefix, meaning that you had
only one valid unicast address (last bit == 1) in addition to the router
anycast address (last bit == 0).

Normally, IPv6 networks are supposed to use 64-bit on-link prefixes but
the implementation can be written in such a way that other prefix
lengths can be configured.

Setting your tunnel prefix to /64 is certainly the right thing to do. 

	MikaL


  reply	other threads:[~2003-07-10 23:49 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-10 15:43 2.4.21+ - IPv6 over IPv4 tunneling b0rked CaT
2003-07-10 15:55 ` YOSHIFUJI Hideaki / 吉藤英明
2003-07-10 15:58   ` CaT
2003-07-10 16:08   ` Pekka Savola
2003-07-10 16:18     ` 2.4.21+ - IPv6 over IPv4 tunneling broken YOSHIFUJI Hideaki / 吉藤英明
2003-07-10 16:19       ` Pekka Savola
2003-07-13 14:49     ` 2.4.21+ - IPv6 over IPv4 tunneling b0rked Anand Kumria
2003-07-13 16:23       ` Pekka Savola
2003-07-10 19:57   ` Mika Penttilä
2003-07-10 16:27 ` Mika Liljeberg
2003-07-10 23:39   ` CaT
2003-07-11  0:04     ` Mika Liljeberg [this message]
2003-07-11  1:49       ` Andre Tomt
2003-07-11  2:03         ` Mika Liljeberg
2003-07-11  2:03         ` 2.4.21+ - IPv6 over IPv4 tunneling broken YOSHIFUJI Hideaki / 吉藤英明
2003-07-11  4:51         ` 2.4.21+ - IPv6 over IPv4 tunneling b0rked Pekka Savola
2003-07-11  5:20           ` Mika Liljeberg
2003-07-11  5:22             ` Pekka Savola
2003-07-11  5:39               ` YOSHIFUJI Hideaki / 吉藤英明
2003-07-11  8:46                 ` Pekka Savola
2003-07-11  9:04                   ` YOSHIFUJI Hideaki / 吉藤英明
2003-07-11  9:39                     ` Mika Penttilä
2003-07-11  9:39                       ` Mika Penttilä
2003-07-11 10:03                     ` Pekka Savola
2003-07-11 10:47                       ` YOSHIFUJI Hideaki / 吉藤英明
2003-07-11 10:47                         ` Pekka Savola
2003-07-11 10:59                           ` YOSHIFUJI Hideaki / 吉藤英明
2003-07-11 10:59                             ` Pekka Savola
2003-07-11 11:03                               ` YOSHIFUJI Hideaki / 吉藤英明
2003-07-11 11:04                                 ` Pekka Savola
2003-07-11 11:36               ` Mika Liljeberg
2003-07-11 11:48                 ` Pekka Savola
2003-07-11 12:09                   ` Mika Liljeberg
2003-07-11 12:48                     ` Mika Penttilä
2003-07-11 13:38                       ` Mika Liljeberg
2003-07-11 14:27                         ` Mika Penttilä
2003-07-11 14:32                           ` Mika Liljeberg
2003-07-11 15:16                             ` Mika Penttilä
     [not found] <20030710.214551.08349572.davem@redhat.com>
2003-07-14 23:49 ` kuznet
2003-07-15  6:14   ` Pekka Savola
2003-07-15 14:46     ` kuznet
2003-07-15 17:29       ` Pekka Savola
2003-07-15 23:19         ` kuznet
2003-07-16  6:03           ` Pekka Savola
2003-07-17  0:03             ` kuznet
2003-07-17  6:50               ` Pekka Savola

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