diff --git a/bin/bw b/bin/bw
new file mode 100755
index 0000000..18ddf4c
--- /dev/null
+++ b/bin/bw
@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+unlimit() {
+    sudo tc qdisc del dev lo root
+}
+
+limit() {
+
+    if [ "$1" = "5Mbps" ]; then
+        sudo tc qdisc del dev lo root
+        sudo tc qdisc add dev lo handle 1: root htb default 11
+        sudo tc class add dev lo parent 1:1 classid 1:11 htb rate 5000kbit
+        sudo tc qdisc add dev lo parent 1:11 handle 10: netem delay 38ms loss 0.09%
+    elif [ "$1" = "10Mbps" ]; then
+        sudo tc qdisc del dev lo root
+        sudo tc qdisc add dev lo handle 1: root htb default 11
+        sudo tc class add dev lo parent 1:1 classid 1:11 htb rate 10000kbit
+        sudo tc qdisc add dev lo parent 1:11 handle 10: netem delay 32ms loss 0.09%
+    elif [ "$1" = "20Mbps" ]; then
+        sudo tc qdisc del dev lo root
+        sudo tc qdisc add dev lo handle 1: root htb default 11
+        sudo tc class add dev lo parent 1:1 classid 1:11 htb rate 20000kbit
+        sudo tc qdisc add dev lo parent 1:11 handle 10: netem delay 25ms loss 0.09%
+    else
+        echo -e >&2 "\x1B[31;1merror:\x1B[0m preset $1 not found"
+        exit 1
+    fi
+}
+
+if [ $# -eq 0 ]; then
+    echo -e >&2 "\x1B[31;1merror:\x1B[0m expecting command"
+    exit 1
+else
+    "$@"
+fi