IBM SC41-5420-04 manual Multihoming Single Host, Single Network, Single Line

Note: The maximum number of interfaces that can be active on a line description at any given time is 128. This is true for all line types (for example, token-ring, Ethernet, frame relay, and so forth).

Example: A Single Host on a Network over a Communications Line

Your server uses one adapter for TCP/IP to attach to a LAN or WAN network. You add one TCP/IP interface. This TCP/IP interface includes the Internet address of your server. With this single Internet address, your server is part of a single TCP/IP network (Figure 47).

Figure 47. Multihoming - Single Host, Single Network, Single Line

Example: Multiple Hosts on the Same Network over the Same Communications Line

Your server uses one adapter for TCP/IP to attach to a LAN or WAN network. You add multiple TCP/IP interfaces. Each of these TCP/IP interfaces includes an Internet address of the same TCP/IP network. With these multiple Internet addresses your server appears as multiple hosts in a single TCP/IP network (Figure 48).

This can be a migration scenario.

Figure 48. Multihoming - Multiple Hosts, Single Network, Single Line

Example: Multiple Hosts on the Same Network over Multiple Communications Lines

Your server uses more than one adapter for TCP/IP to attach to the same LAN or WAN network. You add multiple TCP/IP interfaces. At least one interface is assigned to each adapter/line description. Each of these TCP/IP interfaces includes an Internet address of the same TCP/IP networks. With these multiple Internet

Chapter 2. TCP/IP: Operation, Management, and Advanced Topics 57