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URL: http://www.ietf.org/rfc/rfc2406.txt
The
Encapsulating Security Payload (ESP) header is designed to provide a mix of
security services in IPv4 and IPv6. ESP may be applied alone, in combination
with the IP Authentication Header (AH) [KA97b], or in a nested fashion, e.g.,
through the use of tunnel mode (see "Security Architecture for the
Internet Protocol" [KA97a], hereafter referred to as the Security
Architecture document). Security services can be provided between a pair of
communicating hosts, between a pair of communicating security gateways, or
between a security gateway and a host. For more details on how to use ESP and
AH in various network environments, see the Security Architecture document
[KA97a].
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