How can I introduce artificial delay on an a Cisco router interface. (long ping times)?
We currently have a Cisco 3540 router with some T1/E1 VWIC. We are currently experiencing about a 14ms delay when we ping them. We would like to introduce some artificial delay to get us around 40ms to see if our application can handle latency. I have tried configuring the interface, with delay, and transmitter delay but nothing works,
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Are you sure the delay commands affect ICMP traffic? It may be just for traffic traversing the interface and not in sending ICMP echo replies.
Try pinging through the router to a host upstream and not the router itself.
Good luck.
the delay command on the interface is NOT used for that, so you should take it out (if you are using EIGRP you may have upset your routing protocol). You will need a third party box to do this, Ixia and Chariot are the common ones, but if you Google for latency inducers you will find some Open Source linux ones and some cheap black boxes. The best application I have seen for it is probably Shunra, but it is not cheap.
Yeah this is pretty hard to do unless you go out and buy one of those black boxes that have “dials” for setting the delay for you. If you want a cheap solution, you should be able to download nsnam (aka ns-3) and install that on a couple of linux boxes, then put your routers on either side of that setup. The linux servers may have to route for this to work. nsnam is useful for simulating network latency for testing applications. If your app is on a linux pc, then you are probably in good shape: Just add nsnam to your kernel and test away.