vm-start/ethernet_restreint/config_interface.sh

#!/bin/bash

add_bridge() {
    echo "add bridge interface ${bridge}"
    ip link add ${bridge} type bridge

    # authorise qemu to use as interface ${bridge} as bridge
    if cat /etc/qemu/bridge.conf | grep -q "${bridge}"
    then
        echo "bridge already authorised by qemu"
    else
        echo "allow ${bridge}" | tee -a /etc/qemu/bridge.conf
        echo "entry added to /etc/qemu/bridge.conf"
    fi

    echo "activate bridge ${bridge}"
    ip link set dev ${bridge} up
}


ip link add br0 type bridge
ip link set dev tap0 master br0
ip address delete 10.0.2.100/24 dev tap0
ip address add 10.0.2.100/24 dev br0
ip link set dev br0 up
ip route add default via 10.0.2.0 dev br0
ip route add 10.10.0.0/24 via 10.0.2.31

bridge="br1"
add_bridge

bridge="br2"
add_bridge