It can also receive encapsulated packets from the public network, unencapsulate them, and send them to their final destination on the private network. It can receive plain packets from the private network, encapsulate them, create a tunnel, and send them to the other end of the tunnel where they are unencapsulated and sent to their final destination. ISAKMP and IPsec accomplish the following Negotiate tunnel parameters Establish tunnels Authenticate users and data Manage security keys Encrypt and decrypt data Manage data transfer across the tunnel Manage data transfer inbound and outbound as a tunnel endpoint or router The ASA functions as a bidirectional tunnel endpoint. The ASA uses the ISAKMP and IPsec tunneling standards to build and manage tunnels.

Each secure connection is called a tunnel. Configuring IPsec Clearing Security Associations Clearing Crypto Map Configurations Supporting the Nokia VPN Client Information About Tunneling, IPsec, and ISAKMP Tunneling makes it possible to use a public TCPIP network, such as the Internet, to create secure connections between remote users and a private corporate network. It includes the following sections Information About Tunneling, IPsec, and ISAKMP Licensing Requirements for Remote Access IPsec VPNs Guidelines and Limitations Configuring ISAKMP Configuring Certificate Group Matching for IKEv. X Series Firewalls Configuring IPsec and ISAKMP This chapter describes how to configure Internet Protocol Security IPsec and the Internet Security Association and Key Management Protocol ISAKMP standards to build Virtual Private Networks VPNs. Configuring IPSec and ISAKMP Cisco ASA 5. 0 Series Configuration Guide using the CLI, 8.

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