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Enter the STRTCP command to ensure that your TCP/IP stack is active. If it is
active, you should receive message TCP1A04, TCP/IP currently active. If
TCP/IP is not active, entering the STRTCP command will activate TCP/IP on your
AS/400. Verify that no errors occurred while starting TCP/IP on your AS/400.
2. Verify your AS/400 TCP/IP software.
On the AS/400 system, the host name LOOPBACK and the interface with a line
description value of *LOOPBACK, are reserved for verifying the AS/400 TCP/IP
software. If you specify the LOOPBACK host name, no data is sent out on any
of the physical lines. This allows you to quickly determine if TCP/IP software is
working correctly on your AS/400 system.
To verify your TCP/IP software:
a. Ensure the local host table has an entry for a LOOPBACK host name and
internet address of 127.0.0.1.
b. Ensure that the interface associated with the LOOPBACK host is active. The
internet address usually associated with the LOOPBACK interface is
127.0.0.1. Ensure that there is an interface with the LOOPBACK host
name’s IP address configured with a line description of *LOOPBACK. Use
the command:
NETSTAT OPTION(*IFC)
to view the LOOPBACK interface’s status. If it is not active, use option 9 to
activate it.
c. After verifying that the LOOPBACK host’s interface is active, type:
PING RMTSYS(LOOPBACK)
The loopback host allows the user to:
v Test FTP, TELNET, LPR or user-written application programs without
being attached to a physical line or network.
v Verify that the TCP/IP software is installed and operating correctly.
Note: A similar test can be performed by using the PING command to verify
connection with one of your other locally defined IP addresses.
d. To test the software and hardware (adapter and network connection), specify
the internet address of an external host on your network:
PING RMTSYS('nnn.nnn.nnn.nnn')
Depending on the line type of the local adapter, this command sends data
out to the local adapter and is received again by the adapter and then
responded to in the same way as the previous command.
Note: Ethernet does not send the data out on the Ethernet backbone if the
internet address is for the local adapter.
e. If you cannot successfully verify your system’s connection to the network by
specifying your system name or its internet address, check the source
service access point (SSAP) of the line description associated with the
interface. X'AA' must be specified as an entry in the SSAP (source service
access point) list. This occurs by default when a new line description is
created if the SSAP parameter is left at its default value of *SYSGEN. If you
have an existing line description, use the Change Line Description command
to add these values to the list.
432 OS/400 TCP/IP Configuration and Reference V4R4
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