You need to visit the next two screens only if you are configuring a
non-gateway node that is on the same network as a gateway. In this case, the
non-gateway node needs to know the identity of any neighbor gateway.
Neighbor gateways can be either full or half gateways.
Gateways that are on the same network are called neighbor gateways. A
non-gateway node on a Point-to-Point network may need to go through a neighbor
gateway in order to send messages to an entirely different network. (Two nodes
are on the same network if the network portion of their IP addresses are
the same.) All Point-to-Point nodes that are on the same network as a neighbor
gateway need to know the identity of any neighbor gateways. When you configure
a Point-to-Point node, you enter into its configuration the identity of any
accessible neighbor gateways that share the same network. The identified
gateways may be either full or half gateways.
You may designate one gateway as a default gateway. Messages for a
network will be routed to the default gateway if there is no gateway configured
for the destination network. The default gateway will then attempt to locate
the destination of the message.
In the Gateway name field, enter the name of a gateway
that is on the same network as the node that you are
configuring. (Nodes are on the same network if the network portions
of their IP addresses are the same).
If you are adding the identified gateway for the first time, press
the [Add] key. If you are modifying the configuration of this
node, press the [Modify] key. The Neighbor Gateway Reachable
Networks screen will be displayed. Proceed to the section in this
chapter titled "To Identify Neighbor Gateway Reachable
Networks."
Repeat steps 1 and 2 for each gateway that is on the same network
as the node that you are configuring. When you have finished, press
the [Prior Screen] key to return to the Point-to-Point
Configuration screen and proceed to the section in this chapter
titled "To Configure Node Mapping."
Fields
Gateway name
Each gateway name can be as long as eight alphanumeric characters. The
first character must be alphabetic.
Specify Neighbor Gateway Reachable Networks
The Neighbor Gateway Reachable Networks screen (#158) in figure 7-4 is
displayed when you press the [Add] key or the [Modify] key for a
valid gateway name from the Neighbor Gateways screen (#152) in
Figure 7-3 "Neighbor Gateway Screen".
Figure 7-4 Neighbor Gateway Reachable Networks
In the Neighbor Gateway IP Internet Address field, enter
the IP address of the gateway specified on the Neighbor Gateways
screen. An example of an address is:
C 192.191.191 009.
In the IP Network Address fields under the title
Configured Reachable Networks, enter the IP addresses of all
the remote networks that can be reached through the gateway
whose IP address is configured in the previous field.
The IP subnet mask is optional. If entering one, tab to the next
field. In the IP subnet mask field, enter the number in the
same format as an IP address.
In the field labeled Hops, enter the number of hops (full
gateways) needed to get to the target network. Two partner gateway
halves count as one hop.
Repeat steps 2, 3, and 4 for each remote reachable network. The
information configured in this screen can extend to more than one
page, if necessary, to allow configuration of up to 2550 reachable
networks per link (255 pages and 10 reachable nets per page). If
you need to configure more than 10 networks, press the
[Save Data] key then press the [Next Page] key to enter
more networks.
After you have finished entering the IP addresses of all the
reachable networks, press the [Save Data] key. Press the
[Prior Screen] key to return to the Neighbor Gateways
screen.
Back at the Neighbor Gateways screen, after you have finished
adding all of the neighboring gateways, press the
[Prior Screen] key to return to the Point-to-Point Link
Configuration screen. Proceed to the section in this chapter titled
"To Configure Node Mapping."
Fields
If you have identified any neighbor gateways, then you will also be
identifying: 1) the IP Network Addresses of all of the networks that you
can reach through that gateway, and 2) the number of hops (corresponding
to the number of gateways) that a packet passes through to reach a remote
network from the local network. Two gateway halves count as one hop.
Neighbor Gateway IP Internet Address
The IP address of the gateway whose name you have specified on the
Neighbor Gateways Screen. The IP address is in the same format as on the
Point-to-Point Configuration screen.
IP Network Address
In the fields under this heading, you list the IP addresses of all of
the networks that you will be able to reach through the gateway you are
configuring. You also use this field to indicate whether or not the
gateway is to serve as a default gateway by entering an at sign
(@) to specify that it is a default gateway. Only one
gateway can be designated as a default gateway for each HP e3000
system.
IP Mask (Optional)
The fields under this heading allow you to specify a subnet mask for
each reachable network. This mask is optional. See
Chapter 2 "Networking Concepts" for details on
deriving the IP mask.
Hops
In the fields under this heading, enter the number of hops
corresponding to the number of gateways that a packet travels to reach a
remote network from a local network. Note: if you choose SD,
no other nodes can be accessed through the remote host; it is an
end point in the connection. Enter DC if the link is a leased
line, private line, or other non-switched link.