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Managing TCP/IP Host Tables
In a large network, it can be more efficient to administer iSeries TCP/IP from a
central site. Working with the host table would be time consuming if each system
is individually updated with the TCP/IP configuration menu. Updates can be
made more quickly on one system and then copied to others.
iSeries TCP/IP is designed to protect configuration files, including the host table.
You cannot change the host table file unless you use the Configure TCP/IP menu
or the MRGTCPHT, ADDTCPHTE, RNMTCPHTE, CHGTCPHTE, or RMVTCPHTE
commands. However, you can still import and use a host table from a central site
by using the MRGTCPHT command.
The following host table file types can be imported and merged with the server
host table:
v Host table type *AS400, generated by iSeries TCP/IP Version 3 Release 1
Modification 0 (V3R1M0) or later
v Host table type *AIX, generated by iSeries TCP/IP Version 3 Release 0
Modification .5 (V3R0M5), Version 2 Release 3 (V2R3) or earlier, or many other
IBM and non-IBM systems
v Host table type *NIC, host table format used by public domain systems
You can merge or replace the local server host table with the imported host table.
The name of the database file containing the local host table is QATOCHOST with
member HOSTS in library QUSRSYS. This file is used directly by iSeries TCP/IP;
no conversion into an internal version takes place.
Host File Formats
If you receive a host file and want to use it on your system, the MRGTCPHT
(Merge TCP/IP Host Table) command allows you to specify which format you are
using. You can use host information files that are in either the *NIC format, the
*AIX format, or the *AS400 format. The record length of the imported host table
file is not limited.
Host Table Information with *AIX Files
Table 4 shows the *AIX format supported on the server.
Table 4. *AIX Supported on the AS/400 System
Delimiter Meaning
# (pound sign) Indicates the beginning of a comment. The text
following the pound sign is a comment and is not part
of the host table.
blank, tab Indicates a field delimiter.
Host Table Information with *NIC Files
The *NIC format is often used by hosts in the public domain. A record in a *NIC
file has the following format:
HOST : 128.12.19.1 : Host2.lan.ibm.com,Host2 : PC-AT : DOS : TCP/IP
This entry describes one host (at address 128.12.19.1) with two names
(Host2.lan.ibm.com) and (Host2). The host is an IBM Personal Computer AT
®
computer running MS-DOS and supporting TCP/IP.
Chapter 2. TCP/IP: Operation, Management, and Advanced Topics 51