=====Linux Traffic Control=====
  * Hardware: PC Engines APU (1)
  * OS: Voyage Linux 0.11

  * **eth0:** management
  * **eth1:** bridge with eth1
  * **eth2:** bridge with eth2


==== Create bridge ====
  * Install required packages:<code>apt-get install bridge-utils</code>
  * Configure network:<code>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
</code>

====Control traffic====
Emulate lower bandwidth, packet loss, latency, etc.

  * Example:<code>
# 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
</code>


{{tag>[linux network traffic control]}}