Netopia 4000-Series manual Encryption Support

4-10 Firmware User Guide

them, acting as a home agent (No).

■Tunnels are normally initiated On Demand; however, you can disable this feature. When disabled, the tunnel must be manually established through the call management screens.

■You can specify the Idle Timeout, an inactivity timer, whose expiration will terminate the tunnel. A value of zero disables the timer. Because tunnels are subject to abrupt termination when the underlying datalink is torn down, use of the Idle Timeout is strongly encouraged.

■Return to the Connection Profile screen by pressing Escape.

■Select IP Profile Parameters and press Return. The IP Profile Parameters screen appears.

IP Profile Parameters

Address Translation Enabled:	Yes
NAT Map List...	Easy-PAT
NAT Server List...	Easy-Servers
Local WAN IP Address:	0.0.0.0
Remote IP Address:	173.167.8.10
Remote IP Mask:	255.255.0.0
Filter Set...
Remove Filter Set
RIP Profile Options...

■Enter the Remote IP Address and Remote IP Mask for the host to which you want to tunnel.

Encryption Support

Encryption is a method for altering user data into a form that is unusable by anyone other than the intended recipient. The recipient must have the means to decrypt the data to render it usable to them. The encryption process protects the data by making it difficult for any third party to get at the original data.

Netopia PPTP is fully compatible with Microsoft Point-to-Point Encryption (MPPE) data encryption for user data transfer over the PPTP tunnel. Microsoft Windows NT Server provides MPPE encryption capability only when Microsoft Challenge Handshake Authentication Protocol (MS-CHAP) is enabled. Netopia complies with this feature to allow MPPE only when MS-CHAP is negotiated. MS-CHAP and MPPE are user-selectable options in the PPTP Tunnel Options screen. If either the client or the server side specifies encryption, then encryption becomes mandatory for both.

Netopia’s ATMP implementation supports Data Encryption Standard (DES) data encryption for user data transfer over the ATMP tunnel between two Netopia routers. The encryption option, none or DES, is a selectable option in the ATMP Tunnel Options screen.