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This section only applies if one of the nodes on your network is a gateway. A
neighbor gateway is a gateway that is on the same network as a given
node. A non-gateway node on a 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 on the same network need to know the identities
of any accessible neighbor gateways. Therefore, when using NMMGR to configure
any node, you will be entering the identities of all the neighbor
gateways into the configuration of the node. Following is an example:
Example: Identifying Neighbor Gateways of Node B
In Figure 5-3 "Identifying Neighbor Gateways
of Node B", Net 1 is a LAN, Net 2 is an X.25 network, and Net 3 is a
point-to-point network. Node A is on both Net 1 and Net 2 and is a full
gateway between them. Node A is the Neighbor Gateway for all nodes on Net 1 to
reach Net 2. Node C is on Net 1 and Net 3 and is a gateway half. Node C is the
Neighbor Gateway for all nodes on Net 1 to reach Net 3.
If you were configuring a node such as Node B in
Figure 5-3 "Identifying Neighbor Gateways of
Node B", you would enter the identities of Nodes A and C as
neighbor gateways of Node B (at the Neighbor Gateways screen and the
Neighbor Gateway Reachable Networks screen). On the Neighbor Gateway Reachable
Networks screen, you would also enter the IP address of Network 2 as a
Configured Reachable Network reachable through gateway Node A and the IP
address of Network 3 as a Configured Reachable Network reachable through
gateway Node C.
Figure 5-3 Identifying Neighbor Gateways of Node B
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![[Identifying Neighbor Gateways of Node B]](img/gfx25.gif)
