Bandwidth throttling in OS X Jan 22, '08 07:30:00AM • Contributed by: jaguarcy Advanced OS X users know that Darwin comes with ipfw, which can be used to set up a custom firewall. This same service however can be used to also limit bandwidth on specific ports. Example: sudo ipfw pipe 1 config bw 15KByte/s creates a pipe that only allows up to 15KB/s to go through. Then: sudo ipfw add 1 pipe 1 src-