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I want to test a program I have developed on LANs that have a very slow connections. I have two computers here, I want to run a program on one that will kill the bandwidth on my connection. Is there a way I can do this from CMD or another 3rd party software?

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Take a look at the answers to this question on StackOverflow. – Blorgbeard Sep 7 '11 at 12:46
up vote 1 down vote accepted

The simplest but probably not the best way would be to go to network settings, disable auto-negotiation and set low speed manually and then test away.

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If either end is a linux or other common *nix style OS, i'd suggest taking a look at trickle. I can't think of any windows tool offhand, but there's a thread on the very same topic on MDSN that may be of use

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