SECURENETS(4) File Formats and Configurations 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 Individual 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.


May 16, 2020 SECURENETS(4)