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A complete description of the *NIC format is found in Request for Comment (RFC)
952, Internet Host Table Specification. See the RFC Editor Site (http://www.rfc-
editor.org/rfc.html) to retrieve this RFC. The subset supported on the server is
shown in Table 5. The *NIC continuation characters are not supported because the
record length of the file can be up to 512 bytes.
Table 5. *NIC Subset Supported on the AS400 System
Delimiter Meaning
; (semicolon)
1
Indicates the beginning of a comment. The text
following the semicolon is a comment and is not part of
the host table.
NET
2
A keyword introducing a network entry.
GATEWAY A keyword introducing a gateway entry.
HOST A keyword introducing a host entry.
: (colon) A field delimiter.
:: (two colons) Indicates a null field.
, (comma) A data element delimiter.
Notes:
1. If any line in the *NIC table contains a semicolon as the first column value, then that
line is not merged into the server host table.
2. These entries are not merged into the server host table.
Host Table Information with *AS400 Files
The *AS400 file format is the format of the local server host table file used by
iSeries TCP/IP directly. The name of the file is QATOCHOST with member HOSTS
in library QUSRSYS. A single record contains an Internet address, up to four
host/domain names and a text description field. For more details regarding record
and file formats, use the DSPFFD (Display File Field Description) command.
This file can be exchanged between iSeries servers. However, there is no function
to convert from *AS400 to *AIX or *NIC format.
Tips for Merging Host Tables
A maximum of four host names per IP address is allowed when host tables are
merged. For example, if the local host table already has three host names and the
physical file member to be merged has two additional host names, only the first
host name in the physical file is merged into the final host table.
Host names that exist for the same Internet address are not duplicated. If the same
host name is found for Internet addresses that are different, then that host name is
accepted, but a warning message is displayed.
The original copy of the local host table is not saved by the MRGTCPHT (Merge
TCP/IP Host Table) command. To save the original host table, create a copy of the
file QUSRSYS/QATOCHOST.HOSTS by using the Copy File (CPYF) command. Do
this before issuing the MRGTCPHT command.
Merging TCP/IP Host Tables
You can use imported host tables in two ways:
v Overwrite the current host table. To do this, specify Replace Host Table (*Yes)
on the Merge Host Table display.
52 OS/400 TCP/IP Configuration and Reference V5R1