Network Functions
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12.6 Overview of PPP Support by ASG Guard/ASG Guard Plus
PPP is Point-to-Point Protocol, which provides a dial-up connection the ability to emulate a
TCP/IP network connection. Using this protocol, a dial-up session can be used to send SNMP
alarms or Telnet to a Host Port on the ASG Guard/ASG Guard Plus.
The PPP link can be initiated in the ASG Guard/ASG Guard Plus in one of two ways. The user
can either designate a specific port as a dedicated PPP port, or the user may initiate a PPP
connection on demand. See Section 12.11 for details on setting up PPP connections.
12.7 Network Parameters
If the ASG Guard/ASG Guard Plus is part of a network, it is necessary to set the Network
Initialization Parameters prior to starting the network module of the ASG Guard/ASG Guard Plus.
Changes made to the Network Initialization Parameters will only take effect if the network has not
yet been started, or by restarting the ASG Guard/ASG Guard Plus. You can restart the ASG
Guard/ASG Guard Plus by issuing the BOOT command from the command prompt to perform a
’soft’ boot.
Before connecting the ASG Guard/ASG Guard Plus to your network, contact your network
administrator and obtain the following information:
•
IP address to be assigned to the ASG Guard/ASG Guard Plus
•
IP address to be used for PPP connections
•
Subnet mask for the network segment to which the ASG Guard/ASG Guard Plus will be
connected
•
IP address of the default gateway to be used by the ASG Guard/ASG Guard Plus
The ASG Guard/ASG Guard Plus allows a user to establish a PPP connection to one of its
modems. This connection allows a Telnet session to either the ASG Guard/ASG Guard Plus or
another device on the network attached to the ASG Guard/ASG Guard Plus. In the latter case
the ASG Guard/ASG Guard Plus acts as a dial up security server.
When a remote user attempts to access other network devices via a PPP session, those devices
must know how to direct their responses back to the user. The simplest way to accomplish this is
with a router that supports RIP, the standard Router Information Protocol. The strategy is to
make the devices on the network direct their responses to the router, and then have the router
forward the data to the ASG Guard/ASG Guard Plus. To do this, ensure that a RIP-enabled
router is on the network, and then configure the other devices to use it as their default gateway.
Then, when a PPP link is established with the ASG Guard/ASG Guard Plus, the ASG Guard/ASG
Guard Plus will automatically use RIP to tell the router how to forward data addressed to the
remote user.
NOTE:
The network number (the first set of numbers) for the PPP connection in the ASG
Guard/ASG Guard Plus should be different than the network number used for the network
IP address. Thus, if the network address of the ASG Guard/ASG Guard Plus is 193.1.1.1
then the PPP address of the network should be something like 192.1.1.1.
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