An Analysis of Centrally Assigned Unique Local Addresses

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Last updated 2007-11-19
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


There has been discussion within the IETF IPv6 community for some time regarding whether or not to define Centrally Assigned Unique Local Addresses (ULA-Cs). Although many arguments both for and against the definition of ULA-Cs have been raised and repeated, our discussions have not resulted in consensus about whether or not to define this new address type. This document will summarize the arguments for and against the allocation of ULA-Cs, in an attempt to help the IETF IPv6 community reach a decision on this issue.


Margaret Wasserman (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)