On Fri, 25 Jul 2008, Iljitsch van Beijnum wrote:
Otherwise they end up transiting enterprise and backbone networks and
potentially arriving at the destination which does something unexpected
No, if there's no translator the packets won't end up at the destination
because the mapped prefix isn't routed on the v6 internet.
If it's the destination address -- yes, but you might be surprised how
widely default routes are being used. Enterprise-ISP egress use them
a lot. Even smaller ISPs use them a lot. With the number of routes
climing, one resolution is using a default route (+well selected more
specifics) -- it might even end up used in medium size ISPs. The
result is probably that packets end up looping between two routers at
some ISP's backbone until the hop count rearches zero.
If it's the source address (it wasn't obvious whether this would be
used, but apparently at least in translator->v6host direction), there
is no check from this POV.
--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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