Seeing lag when pinging my default gateway


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When you ping your default gateway (in standard configuration, as your PC is connected to a switch and that switch is connected to the router, nothing else) the ms you get in Windows are <1ms (sometimes 1ms) but in my case, Im getting strange readings as high as 200ms+ (it even fails at times)..........What could be wrong?

Im not running any software at all on my PC that can be causing traffic and my router has absolutely nothing also eating bandwidth.

What could be the problem, how can I diagnostic it, and how can I solve it?

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If you're connected using an ethernet cable, then either the router is so busy that it can't answer immediately (unlikely but possible), or there's some problem with your computer's software (most likely). If you're using wireless, it could be radio interference.

I'd suggest you try booting from an Ubuntu live cd/usb pen and pinging the default gateway from there. It will at least eliminate the router as the source of the problem.

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Booting liveCD is great check to rule out the OS as a problem. I would also suggest you disconnect everything else from the switch other than your router and then your box your testing with. Also make sure nothing else connect to the router lan ports other than the switch.

You would need to to swap out the cable from the router to the switch as well.

Are any other devices on the network showing this same type of response time. And yes you are correct on a normal lan your response time should be in the sub 1ms range - tops would be right around 1ms. If you seeing 200 then yeah something is really not right!

Do you have any virtual software running on your box where there would be a hook into your interface for bridging or anything? The liveCD idea is great for ruling out something in the OS. But does not rule out the other hardware - the nic, wires, switch or router itself or other things on the network flooding the network. Which is why you need to remove all other connections from the network. If drops back to normal, then start reconnecting your devices until you see the problem return - that should tell you what device is causing the problem on the network. Have seen nics go bad and just flood the network with garbage, etc.

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