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Use the system menus or the Verify TCP/IP Connection (VFYTCPCNN or PING)
command to verify your system’s ability to communicate with a remote system using
TCP/IP.
Note: PING uses the Internet Control Message Protocol (ICMP) to send data to a
host’s Internet address and waits for a response. The user command to
perform this verification is called PING (Packet InterNet Groper) on
non-AS/400 systems. On an AS/400 system, use either the PING command
or the VFYTCPCNN command.
To verify TCP/IP connections, perform the three steps below in the order in which
they are listed:
1. Type VFYTCPCNN and then press F4.
The display for the VFYTCPCNN command appears (Figure 28).
2. Type the name of a remote system as defined in your host table or as defined
by your domain name server.
If you prefer to use an Internet address, type the address enclosed in
apostrophes. You can also type *INTNETADR to be prompted for the Internet
address.
3. Press F10 to view or change the additional parameters.
As you can see in Figure 29 on page 49, the system defaults are to send five
packets of 256 bytes each and to wait 1 second for a response on each packet.
Verify TCP/IP Connection (VFYTCPCNN)
Type choices, press Enter.
Remote system ......... ____________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
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Figure 28. Verify TCP/IP Connection
48 OS/400 TCP/IP Configuration and Reference V4R4