Modifications to the inet6num in the RIPE Database
Wilfried Woeber, UniVie/ACOnet woeber at cc.univie.ac.at
Tue Mar 16 18:21:30 CET 1999
Guy, Engin, thanks a lot for the explanation! Guy said: >Finally, you can only have one of these constructs per address. This is >common sense really since, if you have 3ffe::aaaa::bbbb, you cannot tell >how many zeroes are replaced with the first pair of colons and how many >by the second. There is no convention (AFAIK) for which block would be >written out in full. Personally, since I am lazy, I choose to write out >the fewer number of zeroes (remembering that I only need one zero per >block of 4 hex digits). > >So, some examples of IPv6 addresses are... > >3ffe:1100:0:c00::/52 >= Note the :0: because there is a :: later in the address Engin added: >The algorithm we use translates "5:0:0:78:0:0:0:0" >into "5:0:0:78::" but not "5::78:0:0:0:0". Of course, >both are legal, but we choose to double-colonize the >last group of zeros, and all prefixes are normalized >according to this and then put into the registry. which already gives us two compatible but different ways to deal with that, and >But I don't know what 6bone registry does. interesting, indeed. Taking this one step further, and looking back at what we did with IPv4, where it would be feasible to say 131.130/16, implying 131.130.0.0/16, I wonder if it wouldn't again be worthwhile to restrict the use of these shorthand notations in the Address Registry? Is there a danger for braking something by _not_ allowing the "::" construct in the registry at all, or - in particular - not _in the middle_ of a prefix? Wilfried. -------------------------------------------------------------------------- Wilfried Woeber : e-mail: Woeber at CC.UniVie.ac.at Computer Center - ACOnet : Tel: +43 1 4277 - 140 33 Vienna University : Fax: +43 1 4277 - 9 140 Universitaetsstrasse 7 : RIPE-DB (&NIC) Handle: WW144 A-1010 Vienna, Austria, Europe : PGP public key ID 0xF0ACB369 --------------------------------------------------------------------------
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