IBM SC41-5420-04 - Manual (Page 73)

an Internet address of different TCP/IP networks. With these multiple Internet
addresses, you take part in different TCP/IP networks (Figure 51).
This example is a combination of all of the previous examples discussed.
Example: The Multihoming function
Assume servers SYSNAM02 and SYSNAM03 are connected with a public or
private X.25 network. The Internet address of this network is 9.4.73.64.
In this example, the server SYSNAM03 connects with a service provider by using
TCP/IP and the same X.25 network attachment (Figure 52). The Internet address
assigned by the service provider for the server is 223.1.1.17.
The multihoming function supports multiple networks with the same adapter.
Server SYSNAM03 must handle two different Internet addresses on the same
attachment. To do this, an additional TCP/IP interface needed to be specified
(Figure 53 on page 60).
Figure 51. Multihoming - Multiple Hosts, Multiple Networks, Multiple Lines
Figure 52. Multihoming TCP/IP Network
Chapter 2. TCP/IP: Operation, Management, and Advanced Topics 59