Chapter 18 IPSec VPN
ZyWALL 5/35/70 Series User’s Guide
362
• MD5 (Message Digest 5) produces a 128-bit digest to authenticate packet data.
• SHA1 (Secure Hash Algorithm) produces a 160-bit digest to authenticate packet data.
18.5 VPN Rules (IKE) Gateway Policy Edit
In the VPN Rule (IKE) screen, click the add gateway policy ( ) icon or the edit ( ) icon
to display the VPN-Gateway Policy -Edit screen.
Use this screen to configure a VPN gateway policy. The gateway policy identifies the IPSec
routers at either end of a VPN tunnel (My ZyWALL and Remote Gateway) and specifies the
authentication, encryption and other settings needed to negotiate a phase 1 IKE SA.