securenets(4)                                                    securenets(4)


NAME
     securenets - NIS map security file

SYNOPSIS
     /etc/securenets

DESCRIPTION
     The /etc/securenets file lists networks and hosts that may participate in
     the NIS protocol with this host.  This file is used by both the NIS
     server library nisserv(7p).

     This file contains any number of netmask/address pairs, one per line
     separated by white space.  The netmask controls which bits in an address
     are contained in the match.  It should contain all ones followed by all
     zeros in binary.  A netmask of 255.255.255.255 (all ones in binary) would
     require an exact match of the address.  An example file would be:

          255.255.0.0 128.1.0.0
          255.255.255.255 128.2.1.1
          255.255.255.0 128.3.4.0

     When the NIS libraries are initially loaded into nsd this file is parsed
     into an internal binary format.  When a request from a host is received
     its source address is logically ANDed with the netmask and compared to
     the address.  If they are identical then the request is allowed, else a
     message is logged and the request is ignored.

     When this file is changed a HUP signal must be sent to the nsd daemon for
     the file to be reparsed.  This can be done with the command killall -HUP
     nsd.

FILES
     /etc/securenets

SEE ALSO
     nsd(1M), nisserv(7P)
     IRIX Admin: Networking and Mail
     IRIX Admin: NFS and NIS


                                                                        Page 1