http://www.iseries.ibm.com/tstudio/vpn/index.htm

Check System Requirements
Here's a list of requirements necessary to set up this VPN.

OS/400 requirements include:

OS/400 V4R5 (5769-SS1);

Crypto Service provider (5769-AC2 or 5769-AC3);

Digital Certificate Manager (5769-SS1 option 34);

V4R5 Client Access Express (5769 XE1 with Operations Navigator and the latest service pack).

Windows 2000 requirements include:

Windows 2000 Professional edition;

Windows 2000 High Encryption Floppy Disk (for 3DES).

Once your system meets these requirements, you'll be ready to set up AS/400 IPSec policy.