Basic features Dummynet is made of two basic components: A ``pipe'', which emulates a communication link with an optional input queue pipe 10 config bw 500Kbit/s queue 30KB delay 12ms plr 0.02 ipfw rules which select how traffic should be passed through pipes. 00100 pipe 10 tcp from any to any 80 in 00110 pipe 20 tcp from any to any 22 in 00120 deny icmp from any to any