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)