Re: new revision of rfc2462bis is available
JINMEI Tatuya / 神明達哉 <jinmei@isl.rdc.toshiba.co.jp> Tue, 30 March 2004 23:13 UTC
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Date: Thu, 12 Feb 2004 15:35:33 +0900
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From: JINMEI Tatuya / 神明達哉 <jinmei@isl.rdc.toshiba.co.jp>
To: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
Cc: ipv6@ietf.org
Subject: Re: new revision of rfc2462bis is available
In-Reply-To: <1076442972.2358.11.camel@teapot.felipe-alfaro.com>
References: <y7v65ef1544.wl@ocean.jinmei.org> <1076442972.2358.11.camel@teapot.felipe-alfaro.com>
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>>>>> On Tue, 10 Feb 2004 20:56:12 +0100, >>>>> Felipe Alfaro Solana <felipe_alfaro@linuxmail.org> said: > I don't understand how is it possible for two hosts to communicate when > no stateful server or router advertising a prefix is attached to the > link. In this case, both hosts are configured exclusively with > link-local addresses, but since those addresses have a fe80::/10 prefix, > how can the IPv6 stack know what interface should the packets be sent > on? Just because link-local addresses has a well-known prefix fe80::/10 cannot be the source of the problem. The problem is that link-local addresses are only unique within a single link and are ambiguous for a multi-linked host. If the host in question has only one physical interface to which it is connected to the link and the interface is specified as "the default" (see draft-ietf-ipv6-scoping-arch-00.txt for more details on this), link-local addresses work just like global addresses. Even if the default interface is not specified, link-local addresses will still work when the user specified the correct link (interface) (again, see the scoping-arch draft for details). > For instance, on Linux 2.6 kernels, when trying to ping another host > using its link-local IPv6, an invalid argument error is generated since > the kernel is not able to guess which interface the packet should be > sent to, since any local interface has exactly the same prefix and > length. This gets complicated even more if the machine has multiple > interfaces, for example, two Ethernet interfaces. This is just an implementation. For example, *BSDs have the notion of the "default interface" (and the default link automatically derived from the interface) to implement the scope-arch draft, with which the above scenario works perfectly. So, > I thought that two IPv6-enabled hosts could only communicate if both > have a site-local or global IPv6 address configured. this is not really correct. Also, site-local addresses even have the same problem of ambiguity. And besides, the IETF is now going to kill site-local addresses. Let's just concentrate on link-local and global. JINMEI, Tatuya Communication Platform Lab. Corporate R&D Center, Toshiba Corp. jinmei@isl.rdc.toshiba.co.jp -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
- new revision of rfc2462bis is available JINMEI Tatuya / 神明達哉
- Re: new revision of rfc2462bis is available Felipe Alfaro Solana
- rfc2462bis -- loopback suppression Ole Troan
- Re: rfc2462bis -- loopback suppression JINMEI Tatuya / 神明達哉
- Re: rfc2462bis -- loopback suppression Ole Troan
- Re: rfc2462bis -- loopback suppression Michael Hunter
- Re: rfc2462bis -- loopback suppression Greg Daley
- Re: rfc2462bis -- loopback suppression Ole Troan
- Re: rfc2462bis -- loopback suppression Greg Daley
- Re: new revision of rfc2462bis is available JINMEI Tatuya / 神明達哉