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Related Tables and the Host Table
Socket applications require a set of tables from which they can retrieve specific
TCP/IP network data when needed. These are as follows:
v Host table
v Service table
v Protocol table
v Network table
The host table contains a list of host names and corresponding Internet addresses.
Socket applications requesting host data obtain it either from the AS/400 host
database file or from the domain name server.
The service table contains a list of services and the specific port and protocol a
services uses. The protocol table contains a list of protocols used in the TCP/IP
network. The network table contains a list of networks and the corresponding
Internet addresses.
UNIX** systems traditionally store this information in the following files:
v /etc/hosts - host table
v /etc/protocols - protocol table
v /etc/services - service table
v /etc/networks - network table
AS/400 TCP/IP maintains the service, protocol, and network tables as database
files. AS/400 TCP/IP refers to these three tables as related tables. To configure or
view the protocol, services, or network tables, select option 21 (Configure Related
Tables) on the Configure TCP/IP menu. You are shown the display in Figure 67 .
Configure Related Tables
System: SYSNAM03
Select one of the following:
1. Work with service table entry
2. Work with protocol table entry
3. Work with network table entry
Selection or command
===> ___________________________________________________________________
________________________________________________________________________
F3=Exit F4=Prompt F9=Retrieve F12=Cancel
Figure 67. Configure Related Tables Menu
88 OS/400 TCP/IP Configuration and Reference V4R4