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IP Architecture Problems? IP serves as host identifier and host’s location in the network hinders (host) mobility (change of IP = change of identity) limited multihoming support (multiple IPs = multiple identities) lacking support for (host) authentication NATs (and other middleboxes) filter based on upper layer information encrypted communication e.g. using IPsec encryption usually breaks at NATs new (unknown) protocols are not supported can route from private to public network, but not vice-versa cannot easily integrate different networking technologies, e.g. cannot route towards an IPv6 address in a IPv4 domain IP infrastructure does not provide sufficient support for administrative boundaries |