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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 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.) All X.25 nodes that are on the same network as a
neighbor gateway need to know the identity of any 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 gateway configured for the destination network. The default
gateway will then attempt to locate the destination of the message. To Identify Neighbor Gateways (If Any Are Present) | |
The Neighbor Gateways screen (#152) in Figure 8-4 “Neighbor Gateways Screen”is displayed when you press the [Neighbor Gateways]
key at the X.25 Configuration screen (#48) in Figure 8-2 “NS Configuration Screen”. Figure 8-4 Neighbor Gateways Screen
![[Neighbor Gateways Screen]](img/gfx42.gif)
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.
To Identify Neighbor Gateway Reachable Networks | |
The Neighbor Gateway Reachable Networks screen (#158) in Figure 8-5 “Neighbor Gateway Reachable Networks
Screen” 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 8-4 “Neighbor Gateways Screen”. Figure 8-5 Neighbor Gateway Reachable Networks
Screen
![[Neighbor Gateway Reachable Networks Screen]](img/gfx43.gif)
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. 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. Only one gateway can be designated as a default gateway
for each HP 3000 Series 900 system. - 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.
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