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32 Chapter2
Networking Concepts
Internetworks
Gateway Configuration Overview
Gateway configuration includes both identifying neighbor gateways in
each node’s configuration file and configuring gateway half NIs for
nodes that will serve as one half of a gateway half pair. These tasks are
described as follows.
Identifying Neighbor Gateways
If you are including gateways in your internet configuration, you may
want to modify each node’s configuration file so that the node is aware
of all of its neighbor gateways (gateways on the same link). You
accomplish this during configuration of each network interface for
which you want to allow communications over the gateway. You will
find step-by-step instructions for identifying neighbor gateways in each
of the link configuration sections of this manual.
An alternative to identifying neighbor gateways in every node’s
configuration file is to configure a default gateway for the node.
Instructions for doing so are included in this manual.
The next pages show several examples of gateway configuration.
Neighbor Gateway Examples
When using NMMGR to configure any node, you will be entering the
identities of all the neighbor gateways into the configuration of the
node. The following examples illustrate several gateway configuration
scenarios based on the network represented in Figure 2-3.
• Example 1: The node you are configuring may be a non-gateway,
such as node D in Figure 2-3. You would need to enter the identities
of each of its neighbor gateways, in this case nodes C and E, at the
Neighbor Gateways screen. On the Neighbor Gateway Reachable
Networks screen, you would also enter the IP addresses of networks
1 and 3 as two of the configured reachable networks reachable
through gateway node C.
• Example 2: The node you are configuring may be a gateway half,
such as node E in Figure 2-3. You will still need to enter the
identities of the node’s neighbor gateways as you configure the NI (in
this case, node C is the neighbor gateway). You will also need to
configure a gateway half NI for the node, as described under
“Configuring a Gateway-Half Pair.”
• Example 3: The node you are configuring may be a full gateway,
such as nodes B and C in Figure 2-3. Though full gateways are never
actually identified as such in the configuration process, they too,
must know about the other gateways. If you were configuring
node C, you would identify nodes B and E and neighbor gateways.