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I-D ACTION:draft-touch-ipsec-vpn-02.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: Use of IPSEC Transport Mode for Virtual Networks
	Author(s)	: J. Touch, L. Eggert
	Filename	: draft-touch-ipsec-vpn-02.txt
	Pages		: 12
	Date		: 29-Nov-01
	
This document addresses the use of IPSEC to secure the virtual links
of an overlay network. It addresses how IPSEC tunnel mode can
conflict with dynamic routing in an overlay, due to the dependence of
both the security association (SA) and the IP tunnel encapsulation
header on the header of the incoming packet. An alternative is
proposed, where IP tunnel encapsulation occurs as a separate initial
step, followed by IPSEC transport mode on the result. The tunnel
header is determined by the source header, and the SA is determined
by the tunnel header. The result is consistent with dynamic routing
in the overlay. This document discusses this alternative, and its
impact on IPSEC.

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