I have a point to point DS3. There are no errors on either end. However, the latency is triple what it normally is. I called the vendor and they stated that everything was running fine. I was wondering if anyone might know of something I can check on my side, or anything I can ask the vendor to look at specifically? For instance, are there any tests I can have them run that might isolate the problem? I know the question is pretty vague, but my users are complaining about the network and I am having difficulty finding a place to start in resolving this problem. Thanks,
Here is how I might go about it.
1. Get a rough estimate of the geographical distance between the sites. Somewhere on the web is a calculater to get a working number for what the latency based on distance should be. Do not share this with your users.
2. Ping sweep from the serial interface of router a to b. vary the size and quantity.
3. Step the pings back into the network, following the path of the users back to the last layer 3 capable device.
What we are doing here is building the chain of evidence to show that its not a network issue. Each step is supported by the data of the preceding step.
Your carrier is off the hook at this point, unless they have followed some strange physical routing, that might be worth a call.
Even money bet its an application issue with tcp window size or lots of small packets back and forth,