Verifying Additional TCP/IP Connections

> ping '9.4.73.212'

Verifying connection to host system 9.4.73.212.

PING request 1 from 9.4.73.212 took 24 ms. 256 bytes. TTL 64. PING request 2 from 9.4.73.212 took 11 ms. 256 bytes. TTL 64. PING request 3 from 9.4.73.212 took 31 ms. 256 bytes. TTL 64. PING request 4 from 9.4.73.212 took 11 ms. 256 bytes. TTL 64 PING request 5 from 9.4.73.212 took 12 ms. 256 bytes. TTL 64. Round-trip (in milliseconds) min/avg/max = 11/17/31 Connection verification statistics: 5 of 5 successful (100 %).

Figure 18. Successful PING Messages

3.If the PING operation is successful, you should see messages similar to those in Figure 18.

If the PING operation is unsuccessful, you should see messages similar to those in Figure 19.

If you receive an unsuccessful PING message, check your configuration steps. Also check that the configuration at the remote system is correct and that the remote system is not powered down. For additional information about identifying the cause for an unsuccessful connection verification, see TCP/IP Troubleshooting (http://publib.boulder.ibm.com/pubs/html/as400/v5r1/ic2924/info/rzaku/ rzakuoverview.htm) in the Information Center. If you are using the Supplemental Manuals CD, then switch to the iSeries Information Center CD to access this information.

>ping '9.4.73.198'

Verifying connection to host system 9.4.73.198.

No response from host within 1 seconds for connection verification 1. No response from host within 1 seconds for connection verification 2. No response from host within 1 seconds for connection verification 3. No response from host within 1 seconds for connection verification 4. No response from host within 1 seconds for connection verification 5. Connection verification statistics: 0 of 5 successful (0 %).

Bottom

Figure 19. Unsuccessful PING Messages

Note: A datagram sent by TCP or UDP to a system with the name LOOPBACK does not actually leave the system. The IP layer, instead, returns the datagram to the TCP or UDP layer from which it came. The other layers then treat the datagram as a normal incoming datagram. The LOOPBACK host name can be used with any TCP/IP command requiring a system name, such as PING or FTP (or any TCP or UDP application including user-written applications). Using the LOOPBACK default host name provides an ability to test TCP/IP applications without actually connecting to a physical network.

The server defines LOOPBACK as the default host name by automatically creating an entry in the local host table.

Once TCP/IP is configured on the iSeries, and the initial connection is verified, you will probably want to add more systems to your network. When you connect

Chapter 1. Configuring TCP/IP 27