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Update : I learnt a new way! using TC and a linux module is not needed

brctl addbr br0 brctl addif br0 ethX <---- first ethernet interface brctl addif br0 ethY <----- Second Ethernet interface ifconfig br0 up

tc qdisc add dev ethX root netem delay 200ms 400ms 25% loss 15.3% 25% duplicate 1% corrupt 0.1% reorder 5% 50%

Look at the netem module documentation as a WAN emulator is standard with the linux kernel

A simple Netfilter-Bridge utility that drops packets based on a random values that are traversing the linux bridge subsystem. This emulates a bad network link between devices.

This only works with Linux Bridges as it intercepts the FORWARD

Building - just run MAKE

sudo insmod bridgebreak_out.ko

Setup : You need atleast 2 ethernet devices in a bridge
sudo brctl addbr br0
sudo brctl addif br0 eth1
sudo brctl addif br0 eth2
sudo ifconfig br0 up

Show Status : cat /proc/loss
SET Random probability : echo 5000 > /proc/loss (5000 is an example)
A value from 0 to 65535 is valid