TCP/IP Configuration and Management Manual

NonStop Systems Used as Internet Gateways
TCP/IP Configuration and Management Manual—427132-004
F-2
Figure F-2 shows the same two networks illustrated in Figure F-1, but now part of
NETB consists of subnets NETC and NETD. Figure F-2
shows the configuration as
seen from within NETB. However, to the hosts in NETA, all hosts in NETB, NETC, and
NETD appear simply as part of NETB.
Figure F-3 shows how a NonStop system can be connected as a host in an Internet. In
this example, HOST1 and HOST2 are both NonStop systems. Each NonStop system is
connected to a LAN by means of a communications controller. The gateway, HOST3,
is part of the same inter-network environment as both HOST1 and HOST2.
You can set up the Internet so that HOST1 and HOST3 communicate through a
number of intermediate gateways, using different communications media and
protocols.
Figure F-2. Subnets
Note. A subnet is associated with a FILTER object in SLSA, which is opened by the NonStop
TCP/IP process, or by using the loopback driver for testing. Up to 13 subnets can be attached
to each NonStop TCP/IP process: 8 LAN, 1 loopback driver, and 4 X.25 type subnets. A
maximum of 4 subnets may be configured for each LAN subnet type.
019VST .VSD
HOST4
98.0.1.6
37.0.4.1
HOST7
37.0.3.9
HOST8
37.0.3.2
37.2.0.1
HOST6
37.0.8.1
37.1.0.1
HOST2
98.0.3.1
Subnet NETD
Internet Address
= 37.2.0.0
HOST12
37.2.8.1
HOST11
37.2.2.9
HOST1
98.0.2.9
Gateway
HOST9
37.1.0.8
HOST10
37.1.3.5
Gateway
HOST3
98.0.7.4
Network NETB
Internet
Address
= 37.0.0.0
Gateway
Subnet NETC
Internet
Address
= 37.1.0.0
Network NETA
= 98.0.0.0
Internet
Address