Netopia R2020 User Reference Manual page 119

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.
ATMP Partner IP Address:
Tunnel Via Gateway:
Network Name:
Password:
Data Encryption...
Key String:
Initiate Connections:
On Demand:
Idle Timeout (seconds):
Enter an IP address in decimal and dot form (xxx.xxx.xxx.xxx).
In this Screen you will configure the GRE/ATMP specific connection params.
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.
Note: Profiles using ATMP do not offer a Telco Options screen.
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 an 8-byte Key String when DES is selected. When encryption is None, this field is
ATMP Tunnel Options
173.167.8.134
0.0.0.0
sam.net
****
DES
Yes
Yes
300
Virtual Private Networks 9-17