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Virtual Private Networks (VPNs) 4-9
When you define a Connection Profile as using ATMP by selecting ATMP as the datalink encapsulation method,
and then select Data Link Options, the ATMP Tunnel Options screen appears.
Note: An ATMP tunnel cannot be assigned a dynamic IP address by the remote server, as in a PPP
connection. When you define an ATMP tunnel profile, the Local WAN IP Address, assigned in the IP Profile
Parameters screen, must be the true IP address, not 0.0.0.0, if NAT is enabled.
■ ATMP Partner IP Address specifies the address of the other end of the tunnel. When unspecified, the
gateway can not initiate tunnels (i.e., act as a foreign agent) for this profile; it can only accept tunnel
requests as a home agent.
■ When you specify the ATMP Partner IP Address, and the address is in the same subnet as the Remote IP
Address you specified in the IP Profile Parameters, you can specify the route (Tunnel Via Gateway) by which
the gateway partner is reached. If you do not specify the ATMP Partner IP Address, the router will use the
default gateway to reach the partner and the Tunnel Via Gateway field is hidden. If the partner should be
reached via an alternate port (i.e., the LAN instead of the WAN), the Tunnel Via Gateway field allows this
path to be resolved.
■ You can specify a Network Name. When the tunnel partner is another Netopia router, this name may be
used to match against a Connection Profile. When the partner is an Ascend router in Gateway mode, then
Network Name is used by the Ascend router to match a gateway profile. When the partner is an Ascend
router in Router mode, leave this field blank.
■ You must specify a Password, used for authenticating the tunnel.
Note: The Password entry will be the same for both ends of the tunnel.
■ For Netopia-to-Netopia connections only, you can specify a Data Encryption algorithm for the ATMP
connection from the pop-up menu, either DES or None. None is the default.
Note: Ascend does not support DES encryption for ATMP tunnels.
■ You must specify a Key String of up to (and including) 20 characters 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
ATMP Tunnel Options
ATMP Partner IP Address: 173.167.8.134
Tunnel Via Gateway: 0.0.0.0
Network Name: sam.net
Password: ****
Data Encryption... DES
Key String:
Initiate Connections: Yes
On Demand: Yes
Idle Timeout (seconds): 300