Download IPSec (2nd Edition) by Naganand Doraswamy PDF

By Naganand Doraswamy

IPSec, moment variation is the main authoritative, entire, available, and updated consultant to IPSec know-how. best gurus hide all aspects of IPSec structure, implementation, and deployment; overview very important technical advances seeing that IPSec used to be first standardized; and current new case experiences demonstrating end-to-end IPSec safety. New assurance additionally contains in-depth counsel on guidelines, updates on IPSec improvements for large-scale company environments, and masses extra.

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Extra resources for IPSec (2nd Edition)

Example text

5. Hosts with transport ESP. When security is not enabled, transport layer packets such as TCP and UDP flow into the network layer, IP, which adds the IP header and calls into the data link layer. When security in transport layer is enabled, the transport layer packets flow into the IPSec component. The IPSec component is implemented as part of the network layer (when intergrated with OS). The IPSec component adds the AH, ESP, or both headers, and invokes the part of the network layer that adds the network layer header.

They may be created manually or dynamically. SAs reside in the Security Association Database (SADB). When created manually, an SA has no lifetime. It exists until it is manually deleted. When created dynamically, an SA may have a lifetime associated with it. This lifetime is generally negotiated between the IPSec peers by the key management protocol. A lifetime is important because the amount of traffic protected by a key, or similarly the time that a key remains active and in use, must be carefully managed.

Transport Mode In transport mode, AH and ESP protect the transport header. In this mode, AH and ESP intercept the packets flowing from the transport layer into the network layer and provide the configured security. Let us consider an example. 5, A and B are two hosts that have been configured so that all transport layer packets flowing between them are encrypted. In this case, transport mode of ESP is used. If the requirement is just to authenticate transport layer packets, then transport mode of AH is used.

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