apt-get install bridge-utils
cat > /etc/network/interfaces <<'EOF'
auto lo
iface lo inet loopback
source /etc/network/interfaces.d/*
EOF
cat > /etc/network/interfaces.d/eth0.conf <<'EOF'
auto eth0
iface eth0 inet dhcp
EOF
cat > /etc/network/interfaces.d/br0.conf <<'EOF'
allow-hotplug eth1
iface eth1 inet manual
allow-hotplug eth2
iface eth2 inet manual
auto br0
iface br0 inet manual
bridge_ports eth1 eth2
bridge_stp on
bridge_maxwait 0
EOF
Emulate lower bandwidth, packet loss, latency, etc.
# Clear queue discipline tc qdisc del dev eth1 root tc qdisc del dev eth2 root # Add 500msec latency tc qdisc add dev eth1 root handle 1:0 netem delay 500msec # Inspect rules tc -s qdisc ls dev eth1 qdisc pfifo_fast 0: root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 Sent 894508 bytes 1187 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 # Never allow more than 50mbit tc qdisc add dev eth1 handle 1: root htb default 11 tc class add dev eth1 parent 1: classid 1:1 htb rate 50mbit tc class add dev eth1 parent 1:1 classid 1:11 htb rate 50mbit tc qdisc add dev eth2 handle 1: root htb default 11 tc class add dev eth2 parent 1: classid 1:1 htb rate 50mbit tc class add dev eth2 parent 1:1 classid 1:11 htb rate 50mbit