Avaya Configuring IP Security Services Manuel d'utilisateur télécharger pdf (Page 20)

Configuring IPsec Services

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304111-B Rev 00

About IPsec

IP Security (IPsec) is the Internet Engineering Task Force (IETF) set of emerging

standards for security services for communications over public networks. The

standards are documented in the IETF Requests for Comments (RFCs) 2401

through 2412. Additional RFCs may be relevant as well.

These standards were developed to ensure secure, private communications for the

remote access, extranet, and intranet virtual private networks (VPNs) used in

enterprise communications. They are the security architecture for the next

generation of IP, called IPv6, but are available for the current IPv4 Internet as

well.

The Bay Networks implementation of the IETF standards provides network

(layer 3) security services for wide area network (WAN) communications on Bay

Networks routers.

IPsec Services

IPsec services consist of confidentiality, integrity, and authentication services for

data packets traveling between security gateways.

• Confidentiality ensures the privacy of communications.

• The integrity service detects modification of data packets.

• Authentication services verify the origin of every data packet.

Confidentiality

Confidentiality is accomplished by encrypting and decrypting data packets. The

Encapsulating Security Payload (ESP) protocol uses the Data Encryption

Standard (DES) algorithm in cipher block chaining (CBC) mode to encrypt and

decrypt data packets.

You set confidentiality with the cipher algorithm and cipher key parameters. The

cipher algorithm and cipher key are specified in security associations (SAs). A

security association is a relationship in which two peers share the necessary

information to securely protect and unprotect data. The algorithm and key must be

identical on both ends of an IPsec SA.

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Avaya Configuring IP Security Services Manuel d'utilisateur Page 20