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A preshared key can only be configured if this option is set to L2TP IPSec VPN or Automatic. Click to select the Use preshared key for authentication check box. In the Key box, type the preshared key value. This value must match the preshared key value that is entered on the VPN-based server. Click OK two times. Pre shared keys are easier to configure than digital certificates, and are typically used for small to medium sized businesses that require a VPN connection. You would usually communicate a pre-shared key via the phone or in person so that it is not captured by anyone such as a hacker sniffing the network.

Configuring an IKE Policy for Preshared Keys

An IKE policy defines a combinationof security parameters (IKE proposals) to be used during IKE negotiation. It defines a peeraddress, the preshared key for the given peer, and the proposals needed for that connection.During the IKE negotiation, IKE looks for an IKE policy that is the same on both peers. Thepeer that initiates the negotiation sends all its policies to the remote peer, and the remotepeer tries to find a match.

A match is made when both policies from the two peers have a proposal thatcontains the same configured attributes. If the lifetimes are not identical, the shorter lifetimebetween the two policies (from the host and peer) is used. The configured preshared key mustalso match its peer.

You can create multiple, prioritized proposals at each peer to ensure thatat least one proposal will match a remote peer’s proposal.

First, you configure one or more IKE proposals; then you associate theseproposals with an IKE policy. You can also prioritize a list of proposals used by IKE in the policy statement atthe description statement at the ike-peer-address] hierarchy level:

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Configuring the Mode for an IKE Policy

IKE policy has two modes: aggressive and main. By default, main mode is enabled. Main mode uses six messages, in three exchanges, toestablish the IKE SA. (These three steps are IKE SA negotiation, a Diffie-Hellmankey exchange, and authentication of the peer.) Main mode also allows a peerto hide its identity.

Aggressive mode also establishes an authenticatedIKE SA and keys. However, aggressive mode uses half the number of messages, has less negotiationpower, and does not provide identity protection. The peer can use the aggressive or main modeto start IKE negotiation; the remote peer accepts the mode sent by the peer.

To configure IKE policy mode, include the aggressive or [edit security ike policy [edit services ipsec-vpn ike policy

A local certificate is an alternative to the preshared key. A commit operation failsif either a preshared key or a local certificate is not configured.

To configure an IKE policy preshared key, include the [edit security ike policy proposals statementat the ike-peer-address] hierarchylevel and specify one or more proposal names:

Example: Configuring an IKE Policy

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Define two IKE policies: policy 10.1.1.2and policy 10.1.1.1. Each policy is associated with proposal-2.

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Updates to the current IKE proposal and policy configuration arenot applied to the current IKE SA; updates are applied to newIKE SAs.

If you want the new updates to take immediate effect, you must clear theexisting IKE security associations so that they will be reestablished with the changed configuration.For information about how to clear the current IKE security association, see the CLI Explorer. Call of duty black ops 2 cd key generator download.