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Extra info for Guide to IPsec VPNs: recommendations of the National Institute of Standards and Technology
This section puts those components together to illustrate how IPsec sessions are set up and executed. Each example includes the use of IKE to establish security associations. The first scenario involves using ESP in a gateway-to-gateway architecture, while the second scenario looks at providing both IPComp and ESP services in a host-to-gateway architecture. The final scenario describes using ESP and AH in a hostto-host architecture. 1 ESP in a Gateway-to-Gateway Architecture In this scenario, the goal is to establish an IPsec connection that provides encryption and integrity protection services between endpoints A and B.
Because ESP uses block ciphers for encryption, padding may be needed so that the encrypted data is an integral multiple of the block size. Padding may also be needed to ensure that the ESP trailer ends on a multiple of 4 bytes. Additional padding may also be used to alter the size of each packet, concealing how many bytes of actual data the packet contains. This is helpful in deterring traffic analysis. + Padding Length. This number indicates how many bytes long the padding is. The Padding Length field is mandatory.
Another significant functional difference between version 1 and version 2 is that version 2 can establish both the IKE SA and the IPsec SA in a total of 4 messages, as follows: + In the first pair of messages, the endpoints negotiate various security parameters, as well as sending each other Diffie-Hellman values and nonces. + In the second pair of messages, the endpoints authenticate each other and establish an IPsec SA. 6 + 39 40 IKE Summary IPsec uses IKE to create security associations, which are sets of values that define the security of IPsec-protected connections.