Mavericks no longer has support for dummynet but still has the code in the backend. Find and copy the IPFW binary from an older machine into /sbin and you're good to go.
Example:
Inject 250ms latency and 10% packet loss on connections between workstation and web server (10.0.0.1) and restrict bandwidth to 1 Mbit/s.
# Create 2 pipes and assigned traffic to/from: $ sudo ipfw add pipe 1 ip from any to 10.0.0.1 $ sudo ipfw add pipe 2 ip from 10.0.0.1 to any # Configure the pipes we just created with latency & packet loss: $ sudo ipfw pipe 1 config delay 250ms bw 1Mbit/s plr 0.1 $ sudo ipfw pipe 2 config delay 250ms bw 1Mbit/s plr 0.1Test:
$ ping 10.0.0.1 PING 10.0.0.1 (10.0.0.1): 56 data bytes 64 bytes from 10.0.0.1: icmp_seq=0 ttl=63 time=515.939 ms 64 bytes from 10.0.0.1: icmp_seq=1 ttl=63 time=519.864 ms 64 bytes from 10.0.0.1: icmp_seq=2 ttl=63 time=521.785 ms Request timeout for icmp_seq 3 64 bytes from 10.0.0.1: icmp_seq=4 ttl=63 time=524.461 msDisable:
$sudo ipfw list |grep pipe 01900 pipe 1 ip from any to 10.0.0.1 out 02000 pipe 2 ip from 10.0.0.1 to any in $ sudo ipfw delete 01900 $ sudo ipfw delete 02000 # or, flush all ipfw rules, not just our pipes $ sudo ipfw -q flush
Round-trip is ~500ms because it applied a 250ms latency to both pipes, incoming and outgoing traffic.
Packet loss is configured with the “plr” command. Valid values are 0 – 1. In our example above we used 0.1 which equals 10% packetloss.
