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 accom-
plish 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 permis-
sion.
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