Creating ETC.IPNODES and /etc/ipnodes

• z/OS® UNIX files can be in any directory. The maximum line length that is supported is 256 characters. If a line is greater than 256 characters, it is truncated to 256 characters and processed. If trace resolver is active, a warning message is issued. If you need more than 256 characters for the IP address and the associated host names, you can code more lines with the same IP address as follows:

  Address1 Hostname1 
  Address1 Hostname2 
  Address1 Hostname3 

• MVS™ data sets must be partitioned organization (PO) or sequential (PS), RECFM=F or RECFM=FB, a logical record length (LRECL) 56 - 256, and have any valid blocksize (BLKSIZE) for fixed block.
• It can contain IPv4 and IPv6 addresses, but not IPv4 mapped addresses. Each IP address can have up to 35 host names. A host name can have up to 35 IP addresses.
• The line starts with an IP address, followed by a blank, followed by host names. Host names are separated by one or more blanks. The first host name that follows an IP address is the official host name, or CNAME (canonical name). Any additional host names that follow the CNAME are alias host names.
• The values for the host name must conform to the following rules:
  • Maximum of 128 characters.
  • Must contain one or more tokens that are separated by a period.
  • Each token must be at least one character and less than 64 characters.
  • The first character in each token must be a letter (A-Z or a-z) or number (0-9).
• A comment is indicated by the # or ; character.

;
;  IBM z/OS Communications Server
;  SMP/E distribution name: EZBREIPN
;
;  5694-A01 (C) Copyright IBM Corp. 2002.
;  Licensed Materials - Property of IBM
;
;  Function: Sample ETC.IPNODES file
;
;  The file contains the Internet Protocol (IP) host names
;  and addresses for the local host and other hosts in the
;  Internet network.
;  This file is used to resolve a name into an address (that is, to
;  translate a host name into its Internet address) or resolve
;  an address into a name.
;
;  Comments begin with a # or ; character and continue until the
;  end of the line.
;
;  The following statement defines the Internet Protocol (IP) name
;  and address of the local host and specifies the names and
;  addresses of remote hosts. The maximum line length support is
;  256 characters
;
;  Entries in the hosts file have the following format:
;
;  Address HostName
;
;  Address HostName1 HostName2 HostName3 ..... HostName35
;
;
;  Address: is an IP address, it can be IPV4 or IPV6 address.
;           Note: IPv4-mapped IPv6 address is not allowed.
;
;  HostName: the length of the hostname is up to 128 characters,
;            and each IP address can have up to 35 hostnames.
;
;
   9.67.43.100 NAMESERVER
   9.67.43.126 RALEIGH
   9.67.43.222 HOSTNAME1.RALEIGH.IBM.COM
   129.34.128.245 YORKTOWN WATSON
   1::2 TESTIPV6ADDRESS1
   1:2:3:4:5:6:7:8 TESTIPV6ADDRESS2
;