[ppml] Keeping the story straight

Stephen Sprunk stephen at sprunk.org
Sat Jun 2 15:02:58 EDT 2007

Thus spake "Christopher Morrow" <christopher.morrow at gmail.com>
> actually I think ULA/ULA-C are not about routability (atleast not
> on the public Internet) at all, they are about 'uniqueness' and a
> backup plan when someone creates a 'unique' space that is the
> same as your 'unique' space... where that backup plan in ULA-C
> is: "I registered this properly, go rechoose and this time register..."

ULA-C uses a different prefix from ULA-L, so nobody using ULA-C (if it 
passes and is implemented) should ever collide with anyone people using 
ULA-L.  The only possible collision is between two orgs using ULA-L, and the 
RFC covers the odds of that happening.

OTOH, one participant in this discussion has already created a voluntary 
system where folks who want to register ULA-L prefixes can do so, and there 
will be zero collisions between participants in that system.  That gets all 
of the supposed benefits of ULA-C without any additional work by the IETF, 
IANA, or RIRs and costs no money.  Bingo, ULA-C is now even more pointless 
than it already was.


Stephen Sprunk      "Those people who think they know everything
CCIE #3723         are a great annoyance to those of us who do."
K5SSS                                             --Isaac Asimov 

More information about the ARIN-PPML mailing list