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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. 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”. 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.
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”. 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.
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