├── throttle.sh
└── README.md


/throttle.sh:
--------------------------------------------------------------------------------
 1 | #!/bin/bash
 2 | 
 3 | LIMIT_TEXT="Kbytes/s"
 4 | LIMIT=$1$LIMIT_TEXT
 5 | 
 6 | if [[ $EUID -ne 0 ]]; then
 7 |    echo "This script must be run as root." 1>&2
 8 |    exit 1
 9 | fi
10 | 
11 | case $1 in
12 | 	"stop")
13 | 		ipfw delete 1
14 | 		echo "Throttling Stopped" 1>&2
15 | 	;;
16 | 	"gprs")
17 | 		ipfw pipe 1 config bw 30$LIMIT_TEXT
18 | 		ipfw add 1 pipe 1 tcp from any to me
19 | 		echo "Throttling download to 30$LIMIT_TEXT" 1>&2
20 | 	;;
21 | 	"edge")
22 | 		ipfw pipe 1 config bw 200$LIMIT_TEXT
23 | 		ipfw add 1 pipe 1 tcp from any to me
24 | 		echo "Throttling download to 200$LIMIT_TEXT" 1>&2
25 | 	;;
26 | 	"3g")
27 | 		ipfw pipe 1 config bw 14000$LIMIT_TEXT
28 | 		ipfw add 1 pipe 1 tcp from any to me
29 | 		echo "Throttling download to 14000$LIMIT_TEXT" 1>&2
30 | 	;;
31 | 	"4g")
32 | 		ipfw pipe 1 config bw 3000000$LIMIT_TEXT
33 | 		ipfw add 1 pipe 1 tcp from any to me
34 | 		echo "Throttling download to 3000000$LIMIT_TEXT" 1>&2
35 | 	;;
36 | 	*)
37 | 		ipfw pipe 1 config bw $LIMIT
38 | 		ipfw add 1 pipe 1 tcp from any to me
39 | 		echo "Throttling download to $LIMIT" 1>&2
40 | 	;;
41 | esac


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # OSx Bandwidth Throttler (this will work for any *nix)
 2 | 
 3 | ## Basic Usage
 4 | 
 5 | - Download throttle.sh.
 6 | - Make the file executable with `chmod +x throttle.sh`
 7 | - Run it as the admin with `sudo ./throttle.sh 45`
 8 | - Turn everything off by running `sudo ./throttle.sh stop`
 9 | 
10 | ## Values
11 | 
12 | - Numerical values will adjust to that speed in Kbytes/s e.g. `sudo ./throttle.sh 54`
13 | - Typing stop will reset back to what it should be e.g. `sudo ./throttle.sh stop`
14 | - Typing some predefined constants will result in some throttling e.g. `sudo ./throttle.sh 3g`
15 | 
16 | ## Constants taken from here (http://www.which.co.uk/technology/phones/guides/mobile-broadband/mobile-broadband-speed-and-usage-limits/)
17 | 
18 | - gprs - 30
19 | - edge - 200
20 | - 3g - 14000
21 | - 4g - 3000000
22 | 
23 | ## Help!
24 | 
25 | If you manage to throttle your speed but can't get it to go back to normal you should run this command: `sudo ipfw delete 1`
26 | 
27 | ## Thanks
28 | 
29 | The initial code for building this was inspired by this article by Ben Lakey - http://benlakey.com/2012/10/14/throttle-bandwidth-on-mac-os-x/


--------------------------------------------------------------------------------