Hands On: Broadcast Analysis of UPNP and SSDP Packets

A video overview and best practices on how to reduce broadcasts and find other things to tune.

Tony Fortunato

March 13, 2019

I’ve written many articles on how broadcasts or multicasts can affect performance. I’ve seen as little as 10% broadcast rate cause issues on wireless networks as well as lock up network attached devices.

One of the broadcasts I try to minimize are UPNP and SSDP packets. The methodology used is quite simple, I perform a PC boot up and login baseline.Then I disable UPNP and SSDP and retest the computer. When I’m sure it is not needed, I start a capture with the following capture filter ‘udp port 1900.’The list of addresses in the endpoint report will be my list of devices to clean up.

Just some advice:

-- Always capture after your change for a particular type of device or software to ensure the protocols have been disabled.

-- I have found some devices that require the UPNP server and client to be disabled.

-- Even when you disable these protocols in Windows, an application could either re enable or bring its own UPNP/SSDP protocol.

-- Some applications may have their own version of a discovery protocol like Apple’s Bonjour and Dropbox

Once you get the hang of this you will realize that you can quickly reduce broadcasts and probably find other things to tune.

About the Author(s)

Tony Fortunato

Sr Network Performance Specialist

Tony Fortunato is a network performance expert who has been designing, implementing and troubleshooting networks since 1989. His company, The Technology Firm, provides clients of all sizes with services ranging from project management, network design, consulting, troubleshooting, designing custom-designed training courses, and assisting with equipment installation. Tony's experience in networking started with financial trading floor networks and ISPs, where he learned to integrate and support equipment from various vendors. Tony has taught and presented at numerous colleges and universities, public forums and private classes. He blogs frequently at NetworkDataPediaand has a popular YouTube channel.

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