Configuring the Local Domain and Host Name

vSimple Mail Transfer Protocol (SMTP) requires your host name to be in the host table or on a domain name server.

vYou may want to use your host table on other systems in the network. Your host name must be in the host table on those systems so they can refer to your system by name.

vApplications written to use host table lookup routines may require this information.

When you are finished working with the host table, press F3 (Exit) or F12 (Cancel).

AnyNet/400: APPC over TCP/IP

Advanced program-to-program communication (APPC) over TCP/IP support allows Common Programming Interface (CPI) Communications or Intersystem Communications Function (ICF) applications to run over TCP/IP with no changes. To use the APPC over TCP/IP support, the logical unit (LU) name or the remote location that your application uses must be mapped to an Internet address. For APPC over TCP/IP support, the host table is configured to map Internet addresses to LU names. To do this, you can update the TCP/IP host table using the configuration menus. The format for the host name is:

LUNAME.NETID.SNA.IBM.COM

Step 7—Configuring the Local Domain and Host Name

Within TCP/IP, the primary name associated with your system (your system can have more than one name) is called your local domain and host name. The combination of the local domain and host name forms a fully-qualified host name. The fully qualified host name is the name by which your system is known and identified in the TCP/IP domain. The local domain name is also used by sockets to help in host name resolution at the Domain Name System (DNS) server. The Post Office Protocol (POP) and Simple Mail Transfer Protocol (SMTP) mail servers require that the local domain and host name be configured. It is used, but not required, by line printer requester (LPR), File Transfer Protocol (FTP), and Simple Network Management Protocol (SNMP).

A domain name consists of labels that are separated by periods, for example, SYSNAM890.ROCHESTER.IBM.COM. For hosts, the first label in a domain name is the name of a host that belongs in the domain identified by the other labels. In this example, host SYSNAM890 belongs to the domain ROCHESTER.IBM.COM. SYSNAM890.ROCHESTER.IBM.COM is known as the host’s fully qualified domain name.

To define a local domain name and a host name, use option 12 (Change TCP/IP domain information) from the Configure TCP/IP menu (Figure 2 on page 8).

You may need to configure the local domain name if you use a DNS server that requires a fully qualified host name to resolve an Internet address. For more information on how to do that, see DNS (http://publib.boulder.ibm.com/pubs/html/as400/v5r1/ic2924/info/rzakk/ rzakkkickoff.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.

The iSeries TCP/IP applications concatenate the local domain name to the host name if a period is not used at the end of the domain name. For an example, see Concatenating the Domain Name to the Host Name

22OS/400 TCP/IP Configuration and Reference V5R1