netdefault(8)

NAME
     netdefault - select the default TCP/IP network

SYNOPSIS
     netdefault [-n] sample-device

DESCRIPTION
     Netdefault selects the default network to use of one of the four networks
     a Minix system can be connected to.  One can choose between two different
     ethernet networks and two different pseudo IP networks that can  be  used
     to make a connection over a serial line.

     The sample-device is the name of one of the network devices  in  /dev  to
     use  as the default network.  This device and devices for other protocols
     for the same network will be linked to the default device names  for  the
     network.   The network utilities access the default network through these
     devices, unless a different device is chosen by  setting  an  environment
     variable, or a by a command line switch.

     Use the -n flag to only show what would be done, instead of really  doing
     it.

  Options and environment to change the default
     Many TCP/IP programs implement  the  following  options  and  environment
     variables  to  change the default devices set by netdefault.  The options
     are only implemented for low level programs where it makes sense to  name
     a  network  device.  The environment variables are used in all code.  You
     can run a process and all its children connected to a  different  network
     by setting four environment variables.

     ETH_DEVICE=device
     -E device
          Device to  use  as  raw  ethernet  device  instead  of  the  default
          /dev/eth.

     PSIP_DEVICE=device
     -P device
          Pseudo IP device to use instead of /dev/psip.

     IP_DEVICE=device
     -I device
          IP device to use instead of /dev/ip.

     TCP_DEVICE=device
     -T device
          TCP device to use instead of /dev/tcp.




     UDP_DEVICE=device
     -U device
          UDP device to use instead of /dev/udp.

FILES

     /dev/eth[01]      First and second raw ethernet.

     /dev/psip[23]     First and second Pseudo IP network.

     /dev/ip[0123]     IP  devices  for  two  ethernets  and  two  Pseudo   IP
                       networks.

     /dev/tcp[0123]    TCP devices for same four networks.

     /dev/udp[0123]    UDP devices.

     /dev/eth, /dev/psip, /dev/ip, /dev/tcp, /dev/udp
                       Devices for the default network, links to  the  devices
                       above.   /dev/eth  is  only  present if ethernet is the
                       default, /dev/psip only for pseudo IP.

SEE ALSO
     ip(4), boot(8).

AUTHOR
     Kees J. Bot (kjb@cs.vu.nl)