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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. 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 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]. | | | | |
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: 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 6-5 “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
| | | | | 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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