Basic ipfw usage to throttle your network connection on a Mac (Mountain Lion)

Mac Network Throttle

# Step 1: Creates a pipe that only allows up to 15KB/s to go through.
sudo ipfw pipe 1 config bw 15KByte/s
 
 
# Step 2: Add the pipe to downloads on port 80
sudo ipfw add 1 pipe 1 src-port 80
 
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# Step 2: Add the pipe to uploads and downloads on all ports
sudo ipfw add 1 pipe 1 ip from any to any
 
 
# Step 3: Remove the pipe from the port.
sudo ipfw delete 1