HP E3000 MPE/IX, E3000/IX 32

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.

Chapter 2