Avaya Configuring IPsec Services Manual do Utilizador descarregar pdf (Página 24)

Configuring IPsec Services

1-6

308630-15.1 Rev 00

Figure 1-1 shows how IPsec can protect data communications within an enterprise

and from external hosts.

Figure 1-1. IPsec Environment: Unique SAs Between Routers

IPsec Tunnel Mode

When a security gateway exists at each end of a communication, the security

associations between the gateways are said to be in tunnel mode. The tunnel

metaphor refers to data being visible only at the beginning and end points of the

communication. The IP packets protected by IPsec have regular, “visible” IP

headers, but the packet contents are encrypted, and thus hidden. All BayRS IPsec

communications occur in tunnel mode. Tunnel mode is especially effective for

isolating and protecting enterprise traffic traveling across a public data network, as

shown in Figure 1-1.

IP0088A

Security

associations

(SAs A,B)

Security

associations

(SAs C,A)

Security associations

(SAs B,C)

Server

Router A

Router B Router C

Corporate

headquarters

Host Host

Partner

Branch office

IP security

gateway

IP security

gateway

IP security

gateway

IPsec

services

IPsec

services

IPsec

services

Public

network

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