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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 a Point-to-Point 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 Point-to-Point nodes that
are on the same network as a neighbor gateway need to know the identity
of any neighbor gateways. When you configure a Point-to-Point 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 one gateway as a default gateway.
Messages for a network will be routed to the 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.
| | | |  | NOTE: HP e3000 should not be used as a gateway. | | | | |
Specify Neighbor Gateways (If Any Are Present) | |
The Neighbor Gateways screen (#152) in Figure 7-3 “Neighbor Gateway Screen” is
displayed when you press the [Neighbor Gateways] key at the Point-to-Point Link Configuration screen (#44)
in Figure 7-2 “Point-to-Point Link 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 in this chapter 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 Point-to-Point Configuration screen and
proceed to the section in this chapter titled "To Configure
Node Mapping."
Fields- Gateway name
Each gateway name can be as long as eight alphanumeric
characters. The first character must be alphabetic.
Specify Neighbor Gateway Reachable Networks | |
The Neighbor Gateway Reachable Networks screen (#158) in figure
7-4 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 7-3 “Neighbor Gateway Screen”. In the Neighbor Gateway IP Internet Address field, enter the IP address of the gateway specified
on the Neighbor Gateways screen. An example of an address is: C 192.191.191 009. 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 subnet 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 Point-to-Point Link Configuration
screen. Proceed to the section in this chapter titled "To
Configure Node Mapping."
FieldsIf 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 on the Point-to-Point 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 e3000
system. - IP Mask (Optional)
The fields under this heading allow you to specify
a subnet mask for each reachable network. This mask is optional.
See Chapter 2 “Networking Concepts” for details on deriving the IP mask. - 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. Note: if you choose SD, no other nodes can be accessed
through the remote host; it is an end point in the connection. Enter DC if the link is a leased line, private line, or
other non-switched link.
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