The easiest way to use virtual networking is to use the uml_switch
instance which is configured and running by default.

1. Add an entry to /etc/network/interfaces to configure a persistent
tap interface on the host:

auto tap0
iface tap0 inet static
        address 192.168.1.1
        netmask 255.255.255.0
        tunctl_user uml-net

2. Configure uml_switch to connect to this interface by editing
/etc/default/uml-utilities:

UML_SWITCH_OPTIONS="-tap tap0"

3. Restart the daemon

# /etc/init.d/uml-utilities restart

4. Use the "daemon" transport with UML:

linux eth0=daemon,,/var/run/uml-utilities/uml_switch.ctl

Alternatively, to enable virtual networking using TUN/TAP (the
"tuntap" transport), add trusted users to the uml-net group, e.g.:

adduser bill uml-net

If you wish to use a different group or different permissions, use a
statoverride for /usr/lib/uml/uml_net.  You may also be interested in
the tunctl program, included in this package.

Note also that the uml_net helper is installed in a different place in this
package than by the upstream distribution (/usr/lib/uml/uml_net rather than
PREFIX/bin/uml_net).  This is done in order to comply with FHS.  because
uml_net is not meant to be executed by users, it does not belong in the system
PATH.

 -- Matt Zimmerman <mdz@debian.org>, Fri Sep  5 20:12:02 2003