IPv6 Routing Header - How does it work?

[vriztll at hotmail.com (Vriz)]

Thanks Patrick. May I know if there's any way (using ICMP?) for me at the
source node to find out what is the shortest route to the destination node?
I mean the intermediate nodes addresses.
Thank you.


----- Original Message -----
From: "Patrick R. McManus" <mcmanus at ducksong.com>
To: "Vriz" <vriztll at hotmail.com>
Cc: "__Boston Linux Mail List" <discuss at blu.org>
Sent: Wednesday, April 17, 2002 9:34 PM
Subject: Re: IPv6 Routing Header - How does it work?


> [Vriz: Wed, Apr 17, 2002 at 09:49:23AM +0800]
>
> > IPv6's Routing Header plays the same role as the source routing option
of
> > IPv4, in which the source host specify a list of hops that the packet
must
> > traverse. However, could anyone advise on how the list of hops is
chosen?
> > Thank you.
>
> the list of hops comes from some external source. For example, the -g
> option to traceroute.
>
> LSRR (loose source combined with record route) is a reasonably common
> peering requirment between network providers. It is used to verify
> each provider is obeying the agreed upon peering policy. Suppose
> network A is peered with network B and their peering policy says
> simply A may send traffic destined to 1.0.0.0/8 to B and B may send
> traffic destined to 17.0.0.0/8 to A via the peering circuit. As a
> diagnostic/verification, A could address a traceroute to destination
> 204.0.0.1 but source route it via B's router on the peering
> circuit. This will let A see how B handles a packet destined for a
> third party network - what A wants to make sure of is that it does
> *not* go back through his own network (i.e. that B is not abusing the
> peering circuit to force A to carry traffic that isn't his
> responsibility.)
>
> The use of "traceroute servers" can also provide this information -
> but some companies insist on lsrr because it is a harder thing to
> fake, and the purpose is for verification.
>
> Even away from peering routers, LS is enabled more commonly than this
> thread would lead you to believe.
>
> -P
>
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