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11-18 MAX 6000/3000 Network Configuration Guide
Setting Up Virtual Private Networks
Configuring ATMP tunnels
Telco options...
Call Type=Nailed
Group=1,2
Session options...
ATMP Gateway=Yes
MAX ATMP Tunnels=0
ATMP RIP=Send-v2
The IPX routing parameters are required only if the MAX is routing IPX.
Understanding the ATMP gateway-mode parameters
This section provides some background information about configuring a Home Agent in
gateway mode. For detailed information about each parameter, see the MAX Reference.
Set the following parameters in the Mod Config profile’s ATMP Options subprofile:
IP configuration and Connection profile
The cross-Internet connection to the Foreign Agent is an IP routing connection that the MAX
authenticates and establishes in the usual way. For details, see Chapter 9, “Configuring IP
Routing.”
Parameter Usage
ATMP Mode For the Home Agent, the mode is Home.
Type When you set Type to Gateway, the Home Agent forwards packets
received through the tunnel to the home network across a nailed WAN
connection.
Password
Used to authenticate the ATMP tunnel itself. Must match the password
specified in the Ascend-Home-Agent-Password attribute of each
mobile client’s RADIUS profile. (All mobile clients use the same
password for that attribute.)
SAP Reply
Enables a Home Agent to reply to the mobile client’s IPX Nearest
Server Query if it knows about a server on the home network. If the
parameter is set to No, the Home Agent simply tunnels the mobile
client’s request to the home network.
UDP Port
ATMP uses UDP port 5150 for ATMP messages between the Foreign
Agent and Home Agent. If you specify a different UDP port number,
make sure that the entire ATMP configuration agrees.
GRE MTU
Specifies the Maximum Transmission Unit (MTU) for the path
between the Foreign Agent and Home Agent (as described in “Setting
an MTU limit” on page 11-3).
Force fragmentation
Enables/disables prefragmentation of packets that have the DF bit set,
(as described in “Forcing fragmentation for interoperation with
outdated clients” on page 11-4).
Idle limit
Specifies the number of minutes the Home Agent maintains an idle
tunnel before disconnecting it.