> Second, the IPv6 SL mechanism exposed the fundamental architectural > discrepancy between the traditional application world viewpoint that an > address was a valid identifier, The address *is* a valid identifier in the IP architecture. There is no architectural discrepancy, only an explicit engineering compromise to use the same bit string as both a host identifier and a location identifier. Your repeated assertions that this is an invalid assumption are incorrect. For better or worse, this is the way IP was designed to work. The only invalid assumption is that it's acceptable for the network to fail to support this model, without considerable re-design of not just IP but the entire architecture.