HP 3000 Manuals HP 3000 Manuals
Neighbor Gateway Reachable Networks 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 below in figure 6-12, is displayed when you select a gateway name at the Neighbor Gateways screen (figure 6-11) 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 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 Enter the full network address of a gateway internet address 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," below). There are two methods of entering an internet protocol (IP) address within NMMGR: 1. Enter the fully qualified IP address (for example, Class C, C 192.191.191 009) OR 2. 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 the node portion of the address. Note that network and node portions of all zeroes 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 Enter the internet addresses of the remote networks IP network networks that can be reached through the address gateway whose network address is configured in the previous field. You can also designate this gateway as a default gatewayby 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. Only one gateway can be designated as a default gateway for each 900 Series HP 3000 system. 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) 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 Enter the internet hop count to the reachable networks hops 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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