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NETSTART(8)             OpenBSD System Manager's Manual            NETSTART(8)

NAME
     netstart - command scripts for network startup

SYNOPSIS
     /etc/netstart [interface ...]

DESCRIPTION
     netstart is the command script that is invoked by rc(8) during an auto-
     matic reboot and after single user mode is exited; it performs network
     initialization.

     The netstart script can also be used to start newly-created bridges or
     interfaces, or reset existing interfaces to their default state.  The be-
     haviour of this script is (or can be) controlled to some extent by vari-
     ables defined in /etc/rc.conf, which specifies which daemons and services
     are to be run.

     During the system boot, netstart is executed.  netstart will perform the
     following operations:

     o   Set the machine's name.
     o   Configure the loopback interface.
     o   Configure all the physical interfaces.
     o   Initialize the routing table and set up the default routes.
     o   Configure all the gif(4) and gre(4) interfaces.
     o   Configure all the bridges.

     After the system is completely initialized, it is possible to start a
     newly-created interface or bridge(4), or reset an existing interface to
     its default state, by invoking

           sh /etc/netstart foo0

     where foo0 is the interface or bridge name.

MULTICAST ROUTING
     Routing to the 224.0.0.0/4 net is set up using values from /etc/rc.conf
     according to these rules:

     o   If the multicast settings are as follows:

               multicast_host=NO
               multicast_router=NO

         then multicast routing will not be enabled.

     o   If the multicast settings are as follows:

               multicast_host=NO
               multicast_router=YES

         then multicast routing will be enabled, but no multicast route will
         be set up.  It is expected that a routing daemon, such as mrouted(8),
         will be started as well.

     o   If the multicast settings are as follows:

               multicast_host=YES
               multicast_router=NO
         or:
               multicast_host=foo0     # interface name
               multicast_router=NO

         then multicast routing will be enabled, using the default interface,
         or the interface name specified by multicast_host.

     o   Other cases are configuration errors and will cause multicast routing
         not to be enabled.

SEE ALSO
     bridge(4), gif(4), gre(4), bridgename.if(5), defaultdomain(5),
     hostname.if(5), mygate(5), myname(5), dhcp(8), mrouted(8), rc(8),
     rc.conf(8)

HISTORY
     The netstart command appeared in 4.0BSD.

OpenBSD 3.6                    February 20, 2002                             2