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Subnet mask
Defines which part of an Internet address forms the subnet (subnetwork)
field of an Internet address. An example of a single-network subnet mask is:
255.255.255.128.
Line description
Contains information describing a communications line that is attached to
the AS/400 system, as defined previously in “Step 1—Configuring a Line
Description” on page 30.
To find the names of the currently defined line descriptions, use the Work
with Line Descriptions (WRKLIND) command.
Associated local interface
Allows the network to which this interface is attached appear to be part of
the same network that the associated local interface is attached to. This is
referred to as
transparent subnetting
.
Transparent subnetting allows TCP/IP traffic to flow between the two
physical networks without defining additional routing. This is only valid for
broadcast-capable networks. This also requires the Internet address for Add
TCP/IP Interface (ADDTCPIFC) to be configured in the same network as
the associated local interface. An additional requirement is for the subnet
mask that is defined for the associated local interface.
Automatic start
Refers to whether the TCP/IP interface is started automatically whenever
TCP/IP is started. The default setting is *YES. If you choose *NO, you must
start the interface yourself by using the STRTCPIFC command or by
selecting option 9 (Start) on the Work with TCP/IP Interfaces display, as
shown in Figure 12 on page 32.
To add a TCP/IP interface, do the following:
1. Enter GO TCPADM to get the TCP/IP Administration menu.
2. Select option 1 to get to the Configure TCP/IP menu.
3. Select option 1 on the Configure TCP/IP menu.
The Work with TCP/IP Interfaces display is shown in Figure 12 on
page 32.
4. Type option 1 (Add) at the input-capable top list entry on this display to
go to the Add TCP/IP Interfaces (ADDTCPIFC) display, as shown in
Figure 11 on page 32.
(You can go directly to this display by typing ADDTCPIFC command on
any command line and pressing F4.)
AS/400 TCP/IP supports multihoming, which allows you to specify multiple
interfaces for each line description. For example, multihoming can be used to
assign multiple Internet addresses to a single physical line description. See
“Multihoming Function” on page 79 for further information.
Chapter 2. Configuring TCP/IP 31