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I-D ACTION:draft-lordello-ipsec-vpn-doi-00.txt

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	Title		: VPN-ID-Enhanced IPSec-VPN DOI for ISAKMP
	Author(s)	: C. Lordello, U. Neustadter
	Filename	: draft-lordello-ipsec-vpn-doi-00.txt
	Pages		: 15
	Date		: 21-Aug-00
The IPSec DOI for ISAKMP defines identities for phase 2 exchanges
that are suitable for a flat, unique address space. On the other
hand, different VPN's cannot guarantee a non-overlapping address
space among them. Therefore when security gateways on an ISP network
negotiate IPSec SA's in the context of multiple VPN's, identifying
traffic flows for this multiplicity of VPN's become an issue. Of
course, an alternative would be to have multiple contexts of
security gateways, one for each VPN. Unfortunately that would impose
severe administrative challenges to an ISP, some of which are
described later. Another alternative and a more appealing one would
be to have a single security gateway with a single tunnel endpoint
address, a single X.509 certificate, etc., that exists in a common
context and is able to negotiate IPSec tunnels for any VPN with a
presence in the security gateway. For the later to be possible
however, it is required for this common security gateway to be able
to negotiate phase 2 SA's on behalf of each one of these VPN's with
overlapping address spaces. A second motivation for the later
approach would be to simply negotiate IPSec tunnels for each VPN as
a whole without implying any specific traffic flow. This
specification describes an extended DOI for ISAKMP which, while
inheriting the existing IPSec DOI in its entirety, defines extra
types of phase 2 identities which include a VPN-ID field as an extra
piece of tunnel identity, i.e., a qualifier for the IP addresses
selectors. The VPN-ID is defined in RFC 2685.

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