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The Neighbor Gateway Reachable Networks screen (#158) is used to enter internet
routing information. It supplies the internet address of a neighbor internet
gateway, lists addresses of remote networks which are reachable through that
gateway, and indicates the distances to those remote networks. A neighbor
gateway is a gateway node that belongs to the same network as the node you are
configuring. This means that the network portion of the internet address for
the gateway is the same as the network portion of the address you entered for
the network interface you are configuring.
The screen, shown in Figure 6-12 "Neighbor
Gateway Reachable Networks Screen", is displayed when you select a gateway
name at the Neighbor Gateways screen (Figure
6-11 "Neighbor Gateways") and press the [Add] or [Modify]
function keys. It is also displayed when you type the path name:
@NETXPORT.NI.NIname.INTERNET.gatewayn
in the Command window of any screen and press the [Enter] key, where
NIname is a configured point-to-point NI, and gatewayn is the
configured point-to-point NI gateway name.
Figure 6-12 Neighbor Gateway Reachable Networks Screen
Press the [Save Data] function key to transfer the data displayed on the
screen to the configuration file you are creating or updating. Verify that the
data record has been created by checking that the Data flag is set to
Y.
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NOTE: 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). Press [Next Page]
to proceed to a new page. Press [Prev Page] to display a prior page. Use
[First Page] to display the first page (for example, if you are viewing
the third page, pressing [First Page] will immediately display the first
page). Press [Last Page] to display the last page of reachable networks
that has been configured. To consolidate reachable networks entries (from
several pages, for example) press [Condense Page].
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Fields
- Neighbor gateway IP internet address
Enter the full network address of a gateway node (on this network)
that is to be used to reach other networks (any network in the same
internetwork other than the network of which this node is a member). The
network portion of the address must be the same as that entered on the IP
Protocol Configuration screen for the network interface you are
configuring (see "Related screens").
There are two methods of entering an internet protocol (IP) address
within NMMGR:
Enter the fully qualified IP address (for example, Class C,
C 192.191.191 009)
OR
Enter only the network (nnn) and node (xxx)
portions of the IP address as four positive integers between 0 and
255 separated by periods or blanks (for example,
15.123.44.98).
You need not enter the following items as NMMGR will fill these in:
- Class A, B, C
- Leading zeros for the network and node portion of the IP
address.
Addresses are made up of a network
portion and a node portion. The
possible classes of network addresses have the following forms:
- Class C:
C nnn.nnn.nnn xxx
- Class B:
B nnn.nnn xxx.xxx
- Class A:
A nnn xxx.xxx.xxx
where nnn is a value ranging from 000 to 255, representing eight
bits of the network portion of an address and xxx is a value
ranging from 000 to 255, representing node portion of the address. Note
the network and node portions of all zeros or all ones are not allowed.
These are special values.
The leftmost group of nnn has the following ranges for each
address class:
- Class C:
192-223
- Class B:
128-191
- Class A:
001-126
Default value: None
Related screen:
- Configured reachable networks IP network address
Enter the internet addresses of the remote networks that can be
reached through the gateway whose network address is configured in the
previous field.
You can also designate this gateway as a default gateway by entering an
"at" sign (@) in one of the Configured reachable networks IP
network address fields. The network will route messages to the
default gateway if it is unable to locate their destination by any other
means. The default gateway will then attempt to locate the destination.
When specifying reachable networks, entering only the network portions,
and optionally the subnet, of the IP address (setting the node portion to
all zeros) allows this node to communicate with any other node on the
remote network.
If the remote network is subnetted, you can restrict communication of
this node to particular subnets by entering the decimal equivalent of
those subnets and including the IP Mask in the IP mask field.
To allow this node to communicate with other subnets on the local
network, enter the decimal equivalent of the subnet in the IP network
address field and enter the subnet mask in the IP mask field. If you do
not enter a subnet mask one of the following occurs:
If the IP address is the same as the node you are configuring,
the IP mask configured in the IP Protocol Configuration screen
(Figure 6-5 "IP Protocol
Configuration Screen") is used.
If the IP address is different from the node you are
configuring, NMMGR assumes no subnets.
Related screen:
NETXPORT.NI.NIname.INTERNET
This path name corresponds to the Neighbor Gateways screen. A
Neighbor Gateway Reachable Networks screen must be configured for
each gateway configured in the Neighbor Gateways screen.
- IP mask
The IP mask masks a portion of the IP address for subnets. The subnet
is specified in the same format as an IP address; that is, the 32-bit
mask is grouped in octets expressed as decimal integers and delimited by
a "." or a space. For example, a mask for a class A address with the
subnet field being the first 8 bits of the node portion would be
expressed as 255 255.000.000. The default is no IP mask.
- Configured reachable networks hops
Enter the internet hop count to the reachable network whose IP address
is configured to the left of the hops field. (The internet hop count is
the number of full internet gateways that will be used to route a message
to the destination network. If two partner gateway halves are used as
part of the internet route, they are counted as one hop.)
Hop count is used internally to determine which neighbor gateway (if more
than one exists) is on the shortest path to the remote network. If more
than one gateway can reach a given remote network, and the number of hops
to the remote network is equal for each gateway, you can specify which
gateway the Network Transport will use by configuring an artificially
high hop count. The network transport will always use the gateway with
the lowest hop count. If the same hop count value is configured for
multiple gateways, the network transport will choose internally from
among the routes with equal hop counts.
Default value: None
Range: 1-32767
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NOTE: To delete a reachable network entry, fill the field to be deleted
with blanks and press the [Save Data] function key.
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