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We argue that the current model for flow establishment in the Internet: DNS Names, IP addresses, and transport ports, is inadequate due to problems that go beyond the small IPv4 address space and resulting NAT boxes. Even where global addresses exist, firewalls cannot glean enough information about a flow from packet headers, and so often err, typically by being over-conservative: disallowing flows that might otherwise be allowed. This paper presents a novel architecture, protocol design, anddoi:10.1145/1282380.1282403 dblp:conf/sigcomm/GuhaF07 fatcat:64djzqjcvje5joc3b6qla57v5u