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

[John Fraizer]

On Sun, 7 Sep 2003, Gert Doering wrote:

> Hi,
> 
> On Sat, Sep 06, 2003 at 06:37:27PM -0400, John Fraizer wrote:
> > On the other hand, if that
> > address space is not globally routed, it breaks PMTU-Disc, traceroute,
> > etc.
> 
> It does nothing of this, *unless* you're also doing reverse-path filtering
> on your external links (which is a dangerous thing in most cases anyway).
> 
> It breaks pinging / tracerouting *to* a specific router on its IXP
> address, indeed, but not *through* the router, which is by far the
> most common usage.
> 
> Gert Doering


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.


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John Fraizer
EnterZone, Inc 
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