File Formats                                         netconfig(4)


     netconfig - network configuration database




     The network configuration  database,  /etc/netconfig,  is  a
     system  file  used  to store information about networks that
     are connected to the system.  The netconfig database and the
     routines that access it (see getnetconfig(3NSL)) are part of
     the Network Selection component. The Network Selection  com-
     ponent  also  includes  getnetpath(3NSL) routines to provide
     application-specific network search  paths.  These  routines
     access the netconfig database based on the environment vari-
     able NETPATH.  See environ(5).

     netconfig contains an entry for each  network  available  on
     the  system.   Entries are separated by newlines. Fields are
     separated by whitespace and occur in the order in which they
     are   described   below.   Whitespace  can  be  embedded  as
     ``\blank'' or  ``\tab''.  Backslashes  may  be  embedded  as
     ``\\''.   Lines in /etc/netconfig that begin with a # (hash)
     in column 1 are treated as comments.

     Each of the valid lines in the netconfig database correspond
     to an available transport. Each entry is of the form:

       network ID  semantics  flag  protocol-family \
        protocol-name  network-device  translation-libraries

     network ID               A string used to uniquely  identify
                              a  network.  network ID consists of
                              non-null  characters,  and  has   a
                              length  of  at  least 1. No maximum
                              length is specified. This namespace
                              is   locally  significant  and  the
                              local system administrator  is  the
                              naming  authority.  All network IDs
                              on a system must be unique.

     semantics                The semantics  field  is  a  string
                              identifying  the  ``semantics''  of
                              the network, that is,  the  set  of
                              services  it supports, by identify-
                              ing the service interface  it  pro-
                              vides.   The   semantics  field  is

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File Formats                                         netconfig(4)

                              mandatory. The following  semantics
                              are recognized.

                              tpi_clts        Transport  Provider
                                              Interface,  connec-

                              tpi_cots        Transport  Provider
                                              Interface,  connec-
                                              tion oriented

                              tpi_cots_ord    Transport  Provider
                                              Interface,  connec-
                                              tion oriented, sup-
                                              ports       orderly

     flag                     The  flag  field  records   certain
                              two-valued (``true'' and ``false'')
                              attributes of networks.  flag is  a
                              string composed of a combination of
                              characters, each of which indicates
                              the   value  of  the  corresponding
                              attribute.  If  the  character   is
                              present, the attribute is ``true.''
                              If the  character  is  absent,  the
                              attribute   is   ``false.''   ``-''
                              indicates that none of  the  attri-
                              butes are present. Only one charac-
                              ter is currently recognized:

                              v    Visible (``default'') network.
                                   Used   when   the  environment
                                   variable NETPATH is unset.

     protocol family          The protocol  family  and  protocol
                              name   fields   are   provided  for
                              protocol-specific applications. The
                              protocol  family  field  contains a
                              string that identifies  a  protocol
                              family.  The  protocol family iden-
                              tifier follows the  same  rules  as
                              those  for  network IDs; the string
                              consists of non-null characters, it
                              has  a  length  of  at least 1, and
                              there   is   no   maximum    length

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File Formats                                         netconfig(4)

                              specified.  A ``-'' in the protocol
                              family field indicates that no pro-
                              tocol   family  identifier  applies
                              (the network is experimental).  The
                              following are examples:

                              loopback     Loopback   (local   to

                              inet         Internetwork:     UDP,
                                           TCP, and the like.

                              inet6        Internetwork      over
                                           IPv6:  UDP,  TCP,  and
                                           the like.

                              implink      ARPANET imp addresses

                              pup          PUP   protocols:   for
                                           example, BSP

                              chaos        MIT CHAOS protocols

                              ns           XEROX NS protocols

                              nbs          NBS protocols

                              ecma         European      Computer
                                           Manufacturers Associa-

                              datakit      DATAKIT protocols

                              ccitt        CCITT protocols, X.25,
                                           and the like.

                              sna          IBM SNA

                              decnet       DECNET

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File Formats                                         netconfig(4)

                              dli          Direct    data    link

                              lat          LAT

                              hylink       NSC Hyperchannel

                              appletalk    Apple Talk

                              nit          Network Interface Tap

                              ieee802      IEEE 802.2;  also  ISO

                              osi          Umbrella for all fami-
                                           lies  used by OSI (for
                                           example,       protosw

                              x25          CCITT X.25 in particu-

                              osinet       AFI = 47, IDI = 4

                              gosip        U.S. Government OSI

     protocol name            The protocol name field contains  a
                              string  that identifies a protocol.
                              The protocol name  identifier  fol-
                              lows  the  same  rules as those for
                              network IDs; that  is,  the  string
                              consists of non-NULL characters, it
                              has a length of  at  least  1,  and
                              there  is  no maximum length speci-
                              fied.  A ``-'' indicates that  none
                              of the names listed apply. The fol-
                              lowing protocol  names  are  recog-

                              tcp     Transmission Control Proto-

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File Formats                                         netconfig(4)

                              udp     User Datagram Protocol

                              icmp    Internet  Control   Message

     network device           The  network  device  is  the  full
                              pathname of the device used to con-
                              nect  to  the  transport  provider.
                              Typically,  this  device will be in
                              the  /dev  directory.  The  network
                              device must be specified.

     translation libraries    The   name-to-address   translation
                              libraries   support  a  ``directory
                              service'' (a  name-to-address  map-
                              ping  service)  for  the network. A
                              ``-'' in this field  indicates  the
                              absence    of    any    translation
                              libraries. This has a special mean-
                              ing  for  networks  of the protocol
                              family inet :  its  name-to-address
                              mapping  is  provided  by  the name
                              service switch based on the entries
                              for    hosts    and   services   in
                              nsswitch.conf(4).  For networks  of
                              other  families,  a ``-'' indicates
                              non-functional name-to-address map-
                              ping.  Otherwise,  this  field con-
                              sists of a comma-separated list  of
                              pathnames   to  dynamically  linked
                              libraries.  The  pathname  of   the
                              library  can  be either absolute or
                              relative.  See dlopen(3C).

     Each field corresponds to an element in the struct netconfig
     structure.   struct  netconfig and the identifiers described
     on this manual page  are  defined  in  <netconfig.h>.   This
     structure includes the following members:

     char *nc_netid                Network  ID,  including   NULL

     unsigned long nc_semantics    Semantics.

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File Formats                                         netconfig(4)

     unsigned long nc_flag         Flags.

     char *nc_protofmly            Protocol family.

     char *nc_proto                Protocol name.

     char *nc_device               Full pathname of  the  network

     unsigned long nc_nlookups     Number  of  directory   lookup

     char **nc_lookups             Names of  the  name-to-address
                                   translation libraries.

     unsigned long nc_unused[9]    Reserved for future expansion.

     The  nc_semantics  field   takes   the   following   values,
     corresponding to the semantics identified above:

     The  nc_flag  field  is  a  bitfield.  The  following   bit,
     corresponding   to   the   attribute  identified  above,  is
     currently recognized.  NC_NOFLAG indicates  the  absence  of
     any attributes.



     Example 1 A Sample netconfig File

     Below is a sample netconfig file:

       #  The "Network Configuration" File.
       # Each entry is of the form:

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File Formats                                         netconfig(4)

       #   <networkid> <semantics> <flags> <protofamily> <protoname> <device>
       #         <nametoaddrlibs>
       # The "-" in <nametoaddrlibs> for inet family transports indicates
       # redirection to the name service switch policies for "hosts" and
       # "services". The "-" may be replaced by nametoaddr libraries that
       # comply with the SVr4 specs, in which case the name service switch
       # will not be used for netdir_getbyname, netdir_getbyaddr,
       # gethostbyname, gethostbyaddr, getservbyname, and getservbyport.
       # There are no nametoaddr_libs for the inet family in Solaris anymore.
       udp6       tpi_clts      v   inet6   udp    /dev/udp6       -
       tcp6       tpi_cots_ord  v   inet6   tcp    /dev/tcp6       -
       udp        tpi_clts      v   inet    udp    /dev/udp        -
       tcp        tpi_cots_ord  v   inet    tcp    /dev/tcp        -
       rawip      tpi_raw       -   inet    -      /dev/rawip      -
       ticlts     tpi_clts      v   loopback -      /dev/ticlts
       ticotsord  tpi_cots_ord  v   loopback -      /dev/ticotsord
       ticots     tpi_cots      v   loopback -      /dev/ticots




     dlopen(3C),      getnetconfig(3NSL),       getnetpath(3NSL),

     System Administration Guide: IP Services

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