Cool Tools 25: LAN Speed Test

Sometimes the coolest tools are the simplest ones.

Today’s Cool Tool is simply called LAN Speed Test, and the tool pretty much does just that – it tests the speed of various connections in your LAN. It does this by simply writing a 20MB file (configurable) to a file share, reading it back, and timing how long the transfers took.

lan-speed-test

The use case for this was pretty simple: our WCI Portal machine (with an alias of PT-PORTAL) was in a DMZ, and the back-end servers (in this case, PT-INTEGRATION and PT-COLLAB) were on a separate sub-net. The NT Crawler web service was acting very strangely, failing to serve up files through the portal, but serving them up locally just fine.

So, using LAN Speed Test, I was able to confirm (and prove to the network team) that the problem was in the switch/firewall connecting the devices. Notice in the above screen shot how PT-INTEGRATION was able to write and read a 20MB file to PT-COLLAB in about .24s and .28s respectively? And how writing the same data to PT-PORTAL was taking 20.6s and 2.2s, respectively?

Yeah, there’s the smoking gun…

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