[6bone] non-global address space for IXs (was: 2001:478:: as /48)

[Gert Doering]

Hi,

On Sat, Sep 06, 2003 at 07:19:26PM -0400, John Fraizer wrote:
> Sorry Gert.  You don't router IX space and you wind up with the same
> issues as are presented by the boneheads who use RFC1918 address space on
> VISABLE links in V4 space.  *EVERY* link in the chain has to be able to
> participate for PMTU-D to properly function.

Reachability of addresses (because they're visible in the routing
table) has NOTHING to do with the function of PMTU-D.

PMTU-D has those addresses in the *source* of the packet, not in the
destination.

Source IP Filtering (as in "dropping packets sourced from there") will
break PMTU-D.  Route filtering (as in "not knowing where to send 
answer packets to", which isn't needed here) won't.

Gert Doering
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