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 gives the
distances to those remote networks. For the gateway half NI there
is only one neighbor gateway: the partner gateway half. The screen
in Figure 10-12 "Neighbor Gateway Reachable
Networks Screen" is displayed when you select a gateway
name at the Neighbor Gateways screen (Figure
10-11 "Neighbor Gateways Screen") and press the [Add] or
[Modify] function key. 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 the configured gateway-half NI, and gatewayn is the
configured gateway.
Figure 10-12 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.
NOTE: The information configured in this screen can extend to more than
1 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, press
[Condense Page].
Fields
Neighbor gateway IP internet address
Enter the IP address of this node's partner
gateway half. This is the IP address of the partner's home network,
and is the same IP address that you have already configured in the
Internet Protocol Configuration screen for the current NI.
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
supported 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 the node portion of an address.
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:
NETXPORT.NI.NIname.PROTOCOL.IP
The network address (network portion of the IP address) configured
in this screen must match the neighbor gateway IP internet address
configured in the current 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 6-4 "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 determine which gateway the network transport will use by
configuring an artificially high hop count.
The transport always uses the gateway with the smallest hop
count. If the same hop count value is configured for multiple gateways,
then the network transport will choose internally from among the
routes with equal hop counts.
Default value: None
Range: 1-32767
NOTE: To delete a reachable network entry, fill the field
to be deleted with blanks and press the [Save Data] function key.