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I know I can use tc and netem to do
tc qdisc add dev eth0 root netem loss 50%
This would drop 50% of packets in all of eth0 traffic. However, I would like to specify a protocol (UDP, TCP etc), so only packets of this protocol would be dropped.
Use iptables instead – it has a probability option that should allow you to do this, for example:
Adjust the various values to match the desired traffic/direction/probability.