Simulating a Slow Internet Connection

http://ankursethi.in/2013/07/simulating-a-slow-internet-connection/

by GeneralMaximus • 13 years ago

29 12 13 years ago

ankursethi.in

BWStearns2• 13 years ago

Connect to your service via Tor :)

finnw• 13 years ago

Unless your site is on cloudflare

BWStearns2• 13 years ago

I was able to get to a site on cloudflare through Tor yesterday.

Terretta• 13 years ago

If you're on a Mac, try the Network Link Conditioner from the Hardware IO tools downloads in Apple Dev portal.

http://www.neglectedpotential.com/2012/05/slow-your-apps-rol...

PS. The sleep trick is helpful, but in addition to latency, you ideally want to experience packet loss and other weirdness.

tincholio• 13 years ago

For TCP connections packet loss will translate into latency... His method of simulation is not good, though. On linux, he could (probably) emulate this properly with NetEm and some virtual interfaces, by limiting rates and introducing actual "propagation delays"

ddb• 13 years ago

This can be done with native osx tools as well. Here's a snippet I created once:

  # First add a rule for all local traffic to port 80 to go into pipe 1
  # 100 is the rule number which will be used for referencing the rule later
  sudo ipfw add 100 pipe 1 ip from 127.0.0.1 to 127.0.0.1 dst-port http
  
  # To display the rule use
  # sudo ipfw show 100
  
  # configure the settings of the pipe as you please
  # 50kbit/s bandwidth
  sudo ipfw pipe 1 config bw 50Kbit
  # 200ms lag
  sudo ipfw pipe 1 config delay 200ms
  # 20% random packet loss
  sudo ipfw pipe 1 config plr 0.2
  
  # To display the current connections on the pipe use:
  # sudo ipfw pipe 1 show
  
  # when finished testing don't forget to delete rule and pipe
  sudo ipfw delete 100
  sudo ipfw pipe 1 delete

gingerlime• 13 years ago

This looks great, do you know if there's an equivalent for linux? can you do something like this with iptables / ufw?

cortesoft• 13 years ago

The one I have always used on Mac is SpeedLimit: http://mschrag.github.io/

marquis• 13 years ago

Another good method: http://daniel.haxx.se/blog/2010/12/14/add-latency-to-localho...

idunno246• 13 years ago

Can't recommend http://www.charlesproxy.com/ enough for any web development. One of a long list of features is throttling.

binarycrusader• 13 years ago

On Solaris, its trivial to simulate lower bandwidths using VNICs:

https://blogs.oracle.com/JeffV/entry/virtual_network_part_4

Or, alternatively, using flowadm: