From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Fri Dec 21 2007 - 15:18:12 ART
Interesting question, though I don't know the answer but I know that you can
assign unlimited number of aggregatable global unciast IPV6 address to a
single interface simultaneously, but only a "single" link-local address.
That makes me think why next hop and (for example OSPF neighbor command for
IPV6) only use link-local address (and always this is combined by an
interface).
with this in mind, using only "global addresses" would you know which
interface to send the packets on or recurse to an interface similar to IPV4.
I highly doubt it.
I'll wait for a more solid answer myself.
Joseph
On Dec 21, 2007 8:49 PM, suri tk <surendratk@hotmail.com> wrote:
> Hi Experts,
>
>
> I saw this paragraph in Implementing IPv6 networks by Regis Desmeules.
>
>
> "It is not recommended in the IPv6 specifications to use an
> aggregatable
> global unicast or site-local address as a next-hop
> address. If you do,
> Internet Control Message Protocol for IPv6 (ICMPv6)
> redirection messages (Type
> 137) will not work. The next-hop address has
> to be a link-local address.
> However, when you configure a link-local
> address as the next hop, you must
> identify in the configuration the
> corresponding network interface on the
> router. In the Cisco IOS
> Software technology, the recommended syntax for the
> ipv6 route command
> in this situation is ipv6 route ipv6-prefix/prefix-length
> interface
> link-local-address."
>
>
> What is it that causes the redirect messages not to work when a global
> unicast or a site local address is used as a next-hop address.
>
>
> Thanks,
>
> Surendra
>
>
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