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Virtual Private Networks (VPN) 10-79
The IP Profile Parameters screen appears.
■ Enter the Remote IP Address and Remote IP Mask for the host to which you want to tunnel.
Note: A peculiarity associated with VPNs is that when a PAC has NAT applied to a Connection Profile set for
PPTP data link encapsulation, the PNS and devices behind it, cannot Ping the PAC’s tunnel end-point IP
address. This is because ICMP packets have no port association, and thus will be discarded rather than being
processed by NAT.
Ordinarily, Ping is an excellent troubleshooting tool, but it will not be effective in this circumstance. Instead, use
another TCP- or UDP-based network service for troubleshooting. Since the Netopia Router is capable of serving
Telnet and HTTP, we recommend using these services instead of Ping.
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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.
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Notes:
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
Receive RIP: Both
Enter a subnet mask in decimal and dot form (xxx.xxx.xxx.xxx).