Setting up a virtual bridged interface

The above works only if setup can select a physical interface. It does not create the orange0 interface if there is no physical interface left. Fortunately, it is easy to create a bridge interface with the command brctl addbr orange0. This bridge can be used for configuring virtual machines or for binding local services. To create "orange0" persistently at system startup, put this script as "brctl-orange0" in /etc/init.d:

#!/bin/sh
set +x

. /etc/sysconfig/rc
. $rc_functions

case "${1}" in
    start)
    boot_mesg "Create bridge orange0..."
    brctl addbr orange0
    ;;

    stop)
    boot_mesg "Destroy bridge orange0..."
    brctl delbr orange0
    ;;
      *)
    echo "Usage: ${0} {start|stop}"
    exit 1
    ;;
esac

Execute it at startup /etc/rc.d/rc3.d:

ln -sf /etc/init.d/brctl-orange0 S16orange

Setup still cannot find orange0 properly, so the final step is to update /var/ipfire/ethernet/settings: manually:

ORANGE_MODE=bridge
ORANGE_DEV=orange0
ORANGE_ADDRESS=10.0.0.1
ORANGE_NETMASK=255.255.255.0
ORANGE_NETADDRESS=10.0.0.0