Cisco vpn validating identity

IPSec with digital certificate provides the most secure and scalable way to implement a VPN.

Authentication in IPSec can be provided through pre-shared keys (easy to implement) or digital certificate (requires a CA Server trusted by both parties).

This is used to secure IKE Phase 2 negotiations which are used to negotiate IPSec SAs.

In IKE Phase 2, three messages are exchanged between IPSec peers. The first message contains a Hash, IPSec proposals (configured using crypto ipsec transform-set command), a Nonce value and ID.

The peer router examines the IKE policy information and attempts to find a match within its own locally configured IKE policies.

It responds with a Policy Acceptance message of acceptance of one of the sender's policies. The next two message serve to exchange Diffie-Hellman Public-Key values.

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It also requires time synchronization between routers and CA Server.

The following scenario demonstrates IPSec VPN between two Branch routers who obtain a Digital Certificate from a CA Server (Windows Server 2003) based in their Central Office.

First step is to obtain a digital certificate from the trusted CA Server.

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