User`s guide

Chapter 8 Site-to-Site VPN
Create Site to Site VPN
8-42
Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
Hash
The authentication algorithm to be used for the negotiation. SDM supports the
following algorithms:
• SHA_1—Secure Hash Algorithm. A hash algorithm used to authenticate
packet data.
• MD5—Message Digest 5. A hash algorithm used to authenticate packet data.
D-H Group
The Diffie-Hellman Group—Diffie-Hellman is a public-key cryptography
protocol that allows two routers to establish a shared secret over an unsecure
communications channel. SDM supports the following groups:
• group1—D-H Group 1. 768-bit D-H Group.
• group2—D-H Group 2. 1024-bit D-H Group. This group provides more
security than group 1, but requires more processing time.
• group5—D-H Group 5.1536-bit D-H Group. This group provides more
security than group 2, but requires more processing time.
Note Diffie-Hellman group5 is not supported on all routers.
Authentication
The authentication method to be used. The following value is supported:
• PRE_SHARE—Authentication will be performed using pre-shared keys.
• RSA_SIG—Authentication will be performed using digital certificates.
Type
Either SDM Default or User Defined. If no User Defined policies have been
created on the router, this window will show the default IKE policy.