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 performs the fol-
     lowing operations, in the sequence given:

           o   Set the machine's name.
           o   Configure the loopback interface.
           o   Configure all the physical interfaces.
           o   Configure the following non-physical interfaces: trunk(4),
               vlan(4), pfsync(4), and carp(4).
           o   Initialize the routing table and set up the default routes.
           o   Configure the remaining non-physical interfaces: pppoe(4),
               gif(4), and gre(4).
           o   Configure all bridge(4) interfaces.

     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 the following, where foo0 is the interface
     or bridge name:

           # sh /etc/netstart foo0

MULTICAST ROUTING
     To enable multicast(4) routing, the net.inet.ip.mforwarding and/or
     net.inet.ip6.mforwarding sysctl(8) variables should be set to 1.  Routing
     to the 224.0.0.0/4 net is set up using values from /etc/rc.conf according
     to these rules:

     o   The default.  If the multicast settings are as follows then multicast
         routing will not be enabled.

               multicast_host=NO
               multicast_router=NO

     o   If the multicast settings are as follows 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.

               multicast_host=NO
               multicast_router=YES

     o   If the multicast settings are as follows then multicast routing will
         be enabled, using the default interface, or the interface name speci-
         fied by multicast_host.

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

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

SEE ALSO
     multicast(4), defaultdomain(5), hostname.if(5), myname(5), ifconfig(8),
     rc(8), rc.conf(8)

HISTORY
     The netstart command first appeared in 4.0BSD.

OpenBSD 4.7                      May 31, 2007                                2
