AH and ESP are offline?

Hello

Is it fair to say that the protocols AH and ESP are offline?

Thank you.

Protocols AH and ESP to sit just above the intellectual property, if none of them have any kind of feature se error recovery. That the kind of functionality is left to the underlying protocol that is encrypted and authenticated.

For example, if you are encrypting a stream TCP between two hosts, if an end host sees that a package was abandoned it then relay under the TCP protocol. The fact that this package is encrypted within the ESP for part of its route between the two end points makes no difference to the endpoint.

The first line of the RFC AH (2402) says the following:

The IP AH (Authentication Header) is used to provide connectionless integrity and origin authentication of IP datagrams (hereinafter referred to as just "authentication") and to provide protection against replays.

The AH RFC continues that "If the calculated and received ICV match, then the datagram is valid, and it is accepted. If the test fails, then the receiver MUST discard the IP datagram as invalid; ", but noticeably absent is how to inform the other end. In this regard, so yes, they are without a connection.

Tags: Cisco Security

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