securenets(4)							   File Formats 						     securenets(4)

NAME

       securenets - configuration file for NIS security

SYNOPSIS

       /var/yp/securenets

DESCRIPTION

       The   /var/yp/securenets  file  defines	the  networks  or hosts which are allowed access to information by the Network Information Service
       ("NIS").

       The format of the file is as follows:

	   o	  Lines beginning with the ``#'' character are treated as comments.

	   o	  Otherwise, each line contains two fields separated by white space.  The first field is a netmask, the second a network.

	   o	  The netmask field may be either 255.255.255.255 (IPv4), ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff (IPv6) , or the string  ``host''
		  indicating that the second field is a specific host to be allowed access.

       Both  ypserv(1M)  and  ypxfrd(1M)  use the /var/yp/securenets file.  The file is read when the  ypserv(1M) and ypxfrd(1M) daemons begin. If
       /var/yp/securenets is present, ypserv(1M) and ypxfrd(1M) respond only to IP addresses in the range given. In order  for	a  change  in  the
       /var/yp/securenets file to take effect, you must kill and restart any active daemons using ypstop(1M) and ypstart(1M).

       An  important  thing  to note for all the examples below is that the server must be allowed to access itself. You accomplish this either by
       the server being part of a subnet that is allowed to access the server, or by adding an individual entry, as the following:

	 hosts 127.0.0.1

EXAMPLES

       Example 1 Access for Individual Entries

       If individual machines are to be give access, the entry could be:

	 255.255.255.255     192.9.1.20

       or

	 host 192.0.1.20

       Example 2 Access for a Class C Network

       If access is to be given to an entire class C network, the entry could be:

	 255.255.255.0	192.9.1.0

       Example 3 Access for a Class B Network

       The entry for access to a class B network could be:

	 255.255.0.0	9.9.0.0

       Example 4 Access for an Invidual IPv6 Address

       Similarly, to allow access for an individual IPv6 address:

	 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff  fec0::111:abba:ace0:fba5e:1

       or

	 host  fec0::111:abba:ace0:fba5e:1

       Example 5 Access for all IPv6 Addresses Starting with fe80

       To allow access for all IPv6 addresses starting with fe80:

	 ffff::  fe80::

FILES

       /var/yp/securenets    Configuration file for NIS security.

SEE ALSO

       ypserv(1M), ypstart(1M), ypstop(1M), ypxfrd(1M)

NOTES

       The Network Information Service (NIS) was formerly known as Sun Yellow Pages (YP).  The functionality of the two remains the same; only the
       name  has  changed. The name Yellow Pages is a registered trademark in the United Kingdom of British Telecommunications plc, and may not be
       used without permission.

SunOS 5.11							    26 Apr 1999 						     securenets(4)