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Re: IPv6 Type 0 Routing Header issues

Gert Doering <gert@space.net> Thu, 26 April 2007 12:51 UTC

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Date: Wed, 25 Apr 2007 12:10:01 +0200
From: Gert Doering <gert@space.net>
To: Remi Denis-Courmont <rdenis@simphalempin.com>
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Cc: ipv6@ietf.org, Mohacsi Janos <mohacsi@niif.hu>, IPv6 Ops list <ipv6-ops@lists.cluenet.de>, v6ops@ops.ietf.org, Gert Doering <gert@space.net>
Subject: Re: IPv6 Type 0 Routing Header issues
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Hi,

On Wed, Apr 25, 2007 at 10:46:54AM +0200, Remi Denis-Courmont wrote:
> 
> On Wed, 25 Apr 2007 10:24:08 +0200, Gert Doering <gert@space.net> wrote:
> 
> > Well, one could argue that the standard isn't very well-written then - a
> > machine that is a *host* should NEVER forward packets, period.
> 
> That's a BSD bug, not a standard bug.
> 
> The IPv6 specification says host must process RT0. It does not say they must
> forward packets as if they were routers on the sole basis of RT0 presence.
> 
> By the current spec (as far as I understand), if a host receives a RT0, it
> must process it. Then it must apply the same rules to the "new" packet
> destination as it would do to any packet it receives; in particular, if the
> packet cannot be delivered locally, it is dropped. You do the exact same
> thing when you receive a packet from link-layer while you are not the
> destination at network-layer.

Thanks for the clarification.  Indeed, this explains the necessity to
process the RH0 header locally (it might point to a different address on the 
*same host*).

Gert Doering
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