NOTE:
Using a random key can generate a key in excess of 255 characters,
which exceeds ScreenOS limits and might not be accepted by the security
device during update. To reduce the key size, shorten the autogenerated
key value by deleting characters.
•
To use a predefined value for the key, enter a value for the Preshared Key.
•
PKI—Use if your VPN includes extranet devices or you require the additional security
provided by certificates (PKI uses certificates for VPN member authentication). For
details on creating and managing certificates.
For Phase 1, select a proposal or proposal set. You can select from predefined or
user-defined proposals:
•
To use a predefined proposal set, select one of the following:
•
Basic (
nopfs-esp-des-sha
,
nopfs-esp-des-md5
)
•
Compatible (
nopfs-esp-3des-sha
,
nopfs-esp-3des-md5, nopfs-esp-des-sha
,
nopfs-esp-des-md5)
•
Standard (
gs-esp-3des-sha
,
gs-esp-aes128-sha)
NOTE:
You cannot use a predefined proposal set with certificates—you
must select a user-defined proposal or change the authentication method
to Preshared Key.
•
To use a user-defined proposal, select a single proposal from the list of predefined
and custom IKE Phase 1 Proposals. For details on custom IKE proposals.
If your VPN includes only security devices, you can specify one predefined or custom
proposal that NSM propagates to all nodes in the VPN. If your VPN includes extranet
devices, you should use multiple proposals to increase security and ensure compatibility.
Preshared Secrets
You can use the same preshared secret for all nodes in the VPN, or create a unique
preshared secret for communication from a specific node to another node.
Configuring IKE IDs
Every VPN node has a unique identification number, known as an IKE ID. During Phase 1
negotiations, the IKE protocol uses the IKE ID to authenticate the VPN member.
VPN Manager automatically creates the default IKE ID for you, based on the policy- or
route-based members and RAS users, so you do not need to configure this option.
However, if you do not want to use the default IKE ID, you can select a different IKE ID
type and configure an IKE ID for each VPN gateway.
579
Copyright © 2010, Juniper Networks, Inc.
Chapter 12: Configuring VPNs
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