Hi Narsi,
> But, following is a reference from section 7 (last paragraph
> of the section) of the draft which has got me confused.
>
> " One possible reason for such behavior is that the source
> address chosen by the upper-layer is of smaller scope than the
> destination, e.g., when using a link-local source address and a
> site-local destination address. "
You can legitimately form a packet where the source address is of a smaller
scope than the destination address. Due to the forwarding rule of section 9
that Steve noted, this packet will only get to the destination if it resides
in zone of the smaller scoped address. For the example above, this packet
with the link-local source address will get to its destination if (and only
if) the site-local destination resides on the same link. This allows a node
that only has a link-local address to talk to other nodes on its link even
when it only knows their site-local addresses. Granted, this example will
probably be rare. But the same applies for sending from a site-local source
address to a global destination. You want the communication to succeed if
the global address resides in your site. And the forwarding rules will
cause a router to drop the packet (and send an ICMP message back to the
sender) if it tries to leave the site.
Hope this helps,
--Brian
>
> Thanks and Regards
> Narsi
>
>
> >>Narsi,
>
> >>A packet is not permitted to leave the zone of uniqueness
> of its source
> >>address (see section 9 of the scoped architecture draft,
> second bullet),
> >>so your example problems ought not to arise.
>
> Steve
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