A New Internet-Draft is available from the on-line Internet-Drafts
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Title : Traversing HIP-aware NATs and Firewalls: Problem Statement and Requirements
Author(s) : H. Tschofenig, M. Shanmugam
Filename : draft-tschofenig-hiprg-hip-natfw-traversal-06.txt
Pages : 25
Date : 2007-7-11
The Host Identity Protocol (HIP) is a signaling protocol, which
supports mobility and multihoming by adding a new layer in the TCP/IP
stack. By carring relevant parameters in the signaling messages, HIP
can be used to establish IPsec encapsulating security payload (ESP)
security associations between two hosts. Middleboxes (e.g. firewalls
and network address translators) cannot inspect transport layer
headers of data traffic if that traffic is sent over an IPsec ESP
tunnel. However, HIP is designed to be middlebox friendly; it
enables the middleboxes to inspect the signaling messages. The
information that they can derive from that messages enables the
middleboxes to uniquely identify the subsequent data flows, e.g. for
the purposes of multiplexing and demultiplexing . A middlebox that
implements the relevant mechanisms is called "HIP-aware". This
document presents a problem statement and lists some requirements
that are necessary for a HIP-aware middlebox traversal technique.
These include authentication and authorization of signaling end-hosts
by the middleboxes. Such authorization will help the middleboxes to
decide whether or not an end host is allowed to traverse, and can
potentially limit unwanted traffic.
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