diff --git a/scripts/ip-mod.sh b/scripts/ip-mod.sh
new file mode 100755
index 0000000000..e9b509ae59
--- /dev/null
+++ b/scripts/ip-mod.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+# flush rules
+ipfw del pipe 1
+ipfw del pipe 2
+ipfw -q -f flush
+ipfw -q -f pipe flush
+
+if [ "$1" == "" ]; then
+    echo "Options: ip-mod.sh slow"
+    echo "         ip-mod.sh block"
+    echo "         ip-mod.sh reset"
+    echo "         ip-mod.sh restore"
+    exit
+elif [ "$1" == "restore" ]; then
+    echo "restoring normal network"
+    exit
+elif [ "$1" == "slow" ]; then
+    # simulate slow connection <to specific hosts>
+    echo "enabling slow connection"
+    ipfw add pipe 1 ip from any to any
+    ipfw add pipe 2 ip from any to any
+    ipfw pipe 1 config bw 60KByte/s delay 350ms
+    ipfw pipe 2 config bw 60KByte/s delay 350ms
+elif [ "$1" == "block" ]; then
+    echo "enabling blocked connections"
+    ipfw add 1 deny tcp from any to any 1024-65535
+elif [ "$1" == "reset" ]; then
+    echo "enabling reset connections"
+    ipfw add 1 reset tcp from any to any 1024-65535
+fi