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IPALLOCD(8C)                                                      IPALLOCD(8C)

       ipallocd - Ethernet-to-IP address allocator


       Available  only  on  Sun  386i systems running a SunOS 4.0.x release or
       earlier.  Not a SunOS 4.1 release feature.

       ipallocd is a  daemon  that  determines  or  temporarily  allocates  IP
       addresses  within  a network segment.  The service is only available on
       the system which is home to the address authority for the network  seg-
       ment,  currently  the  Network  Information Service (NIS) master of the
       hosts.byaddr map although the service is not tied to the  NIS  service.
       It  has complete knowledge of the hosts listed in the NIS service, and,
       if the system is running the name server, of any hosts listed in inter-
       net domain tables automatically accessed on that host through the stan-
       dard library gethostent(3N) call.

       This protocol uses DES authentication (the Sun Secure RPC protocol)  to
       restrict access to this function.  The only clients privileged to allo-
       cate addresses are those whose net IDs are in the networks  group.  For
       machine IDs, the machine must be an NIS server.

       The  daemon  uses  permanent  entries in the /etc/ethers and /etc/hosts
       files when they exist and are usable.  In other cases, such as  when  a
       system  is new to the network, ipallocd enters a temporary mapping in a
       local cache.  Entries in the cache are removed when there have been  no
       references to a given entry in the last hour.  This cache survives sys-
       tem crashes so that IP addresses remain consistent.

       The daemon also provides corresponding IP address to name mapping.

       If the file /etc/ipalloc.netrange exists, ipallocd refuses to  allocate
       addresses  on networks not listed in the netrange file, or for which no
       free address is available.

       /etc/ipalloc.cache  temporary cache
                           optional file to allocate network addresses
       ipalloc(3R), pnp(3R), ipalloc.netrange(5), ipallocd(8C), netconfig(8C),
       pnpboot(8C), rarpd(8C)
       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.

                                4 December 1987                   IPALLOCD(8C)