Simulate network/transmission latency

I ahve several router in a test bed, however I need to simulate

80-100ms latency between the links, either serial or ethernet. Are there any tools to do this?


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R Siffredi
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Lowering the speed of the serial lines can significantly increase the delay.


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Mike' Newsgroups

There are a bunch of software tools you can run of a PC etc to sinthesize a delay, but you then would need serial interfaces card or to use ethernet

you can find these by searching google.

i prefer dedicated hardware to do this since that way it doesnt vanish from the lab when i dont use it for a while :)

i have used a hardware box designed to simulate anything up to satellite delays (much cheaper than a satellite link!) - 1st came across this when we were debugging a satellite link.

i like this one as you can just alter the delay and error rate on the front panel

formatting link

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R Siffredi

a few 1000 UK pounds - YMMV - i havent spent money on them for a while.

E1 (G.703) interfaces cost extra.

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I just installed NISTNet on a PC with 2 nics and Fedora 4 and it works pretty well. I had to simulate a 140ms delay for a connection from Wisconsin to Czech Republic for app testing. Here is what I did:


The serial connection allows me to adjust clock rate to adjust serialization delay. This is important because here is how my results varied:

Real Circuit:

32 byte ping 140ms 1400 byte ping 156ms

Test w/384000 clock rate:

32 byte ping 139ms 1400 byte ping 193ms

Test w/1300000 clock rate:

32 byte ping 139ms 1400 byte ping 153ms
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