Netopia R6100 Reference Manual page 225

Note: Ascend does not support DES encryption for ATMP tunnels.
You must specify an 8-byte Key String when DES is selected. When encryption is None, this field is
invisible.
You can specify that this router will Initiate Connections, acting as a foreign agent (Yes), or only answer
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.
An alternate way to force a tunnel to stay up is to define a forced up scheduled connection for the profile.
The method works the same way as creating a forced up scheduled connection for the line backup feature.
See "Using Scheduled Connections with Backup" on page 9-8.
Return to the Connection Profile screen by pressing Escape.
Select IP Profile Parameters and press Return. The IP Profile Parameters screen appears.
Address Translation Enabled:
NAT Map List...
NAT Server List...
Local WAN IP Address:
Remote IP Address:
Remote IP Mask:
Filter Set...
Remove Filter Set
Receive RIP:
Enter a subnet mask in decimal and dot form (xxx.xxx.xxx.xxx).
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 foreign agent has NAT applied to a Connection Profile
set for ATMP data link encapsulation, the home agent and devices behind it, cannot Ping the foreign agent'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.
IP Profile Parameters
Yes
Easy-PAT
Easy-Servers
0.0.0.0
173.167.8.10
255.255.0.0
Both
Virtual Private Networks (VPN) 15-23