I-D ACTION:draft-irtf-hiprg-nat-00.txt

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	Title		: Middlebox Traversal Issues of Host Identity
                          Protocol (HIP) Communication
	Author(s)	: M. Stiemerling, et al.
	Filename	: draft-irtf-hiprg-nat-00.txt
	Pages		: 13
	Date		: 2005-10-7

   The Host Identity Protocol (HIP) fundamentally changes the way in
   which two Internet hosts communicate.  One key advantage over other
   schemes is that HIP does not require modifications to the traditional
   network-layer functionality of the Internet, i.e., its routers.  In
   the current Internet, however, many devices other than routers modify
   the traditional network-layer behavior of the Internet.  These
   "middleboxes" are intermediary devices that perform functions other
   than the standard functions of an IP router on the datagram path
   between source and destination hosts.  Whereas some types of
   middleboxes may not interfere with HIP at all, others can affect some
   aspects of HIP communication and others can render HIP communication
   impossible.  This document discusses the problems associated with HIP
   communication across network paths that include specific types of
   middleboxes, namely, network address translators and firewalls.  It
   identifies and discusses issues in the current HIP specifications
   that affect communication across these types of middleboxes.

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