Use the next two screens only if you are configuring a node that is on an an
X.25 network as a gateway. In this case, the local node needs to know the
identity of any neighbor gateways.
Gateways that are on the same network are called neighbor gateways. A
non-gateway node on an X.25 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.) If a node on the X.25 network is trying to access a node on a remote
network, it needs to know the identity of its neighbor gateways. When you
configure an X.25 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 gateways as default gateways. Messages for a network
will be routed to a default gateway if there is no specific 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 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 X.25 Configuration
screen.
Fields
Gateway name
Each gateway name can be as long as eight alphanumeric characters. The
first character must be alphabetic.
In the Neighbor Gateway IP Internet Address field, enter
the IP address of the gateway specified on the Neighbor Gateways
screen. An example is: C 192.007.007 001
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.
An "@" in the IP network address field designates the gateway as a
default gateway. It means this gateway can be used to reach all the
other remote networks.
The IP subnet mask is optional. If entering one, tab to the next
field. In the IP 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 X.25 Configuration screen. Follow
the instructions for step 7 in the section in this chapter titled "To
Configure an X.25 Network."
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 the LAN
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. Multiple gateways can be designated
for each HP e3000 systems.
IP Mask (Optional)
The fields under this heading allow you to specify a subnet mask for
each reachable network. This mask is optional. For details on deriving an
IP subnet mask, see Chapter 2 "Networking
Concepts"
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.