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I want each packet (that match iptables rule) to be delayed by some fixed time interval. How to to this?

Preudocode: iptables -A INPUT -p udp <more conditions> -j DELAY --delay 50000 # delay UDP packets for 50 milliseconds

Update: @related

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Why? Testing purposes? – Shinrai Aug 9 '10 at 22:23
Yes, testing/debugging. Actually tc qdisc add dev eth1 root netem delay 250ms helped. – Vi. Aug 12 '10 at 9:51
up vote 4 down vote accepted

tc qdisc add dev eth1 root netem delay 250ms hack allows to do it globally for the given interface. It includes UDP packets.

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