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After observing several days of really bad WiFi performance (wired connections to the router worked fine), I fired up Wireshark and was surprised to see about 200 packets per second being generated by my father-in-law's Windows laptop.

The Wireshark decoded packets look like this:

M-SEARCH * HTTP/1.1
Host: 239.255.255.250:1900
ST: urn:schemas-canon-com:service:ICPO-WFTEOSSystemService:1
Man: "ssdp:discover"
MX: 3

I understand that SSDP is part of UPnP, and I'm guessing that his laptop is trying (really hard) to find some service.

But what is it searching for and -- more to the point -- what's the proper way to make it stop (besides my interim solution of powering it down!)?

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    canon may suggest its printer or camera related?
    – Journeyman Geek ♦
    Aug 15, 2016 at 6:19
  • Most likely printer drivers looking for their printer. However, 200 packets per seconds is nothing. It’s too much for this service, but no reason for bad network performance. // edit: It’s the “Canon EOS Wireless File Transfer Utility“.
    – Daniel B
    Aug 15, 2016 at 6:25
  • FWIW, it appears that 200 SSDP packets per second really did hurt network performance: On our LAN, ping tests to the modem reported a median RTT of 800 ms with some delays over 3s and occasional dropped packets. Now, with SSDP disabled, I'm seeing RTTs of 2.8 ms. Much bettah.
    – fearless_fool
    Aug 15, 2016 at 8:17
  • So it’s really “bad modem performance”. :P It’s important to make that distinction. Because your modem does not participate in internal communication (which is what I think of when someone mentions “network”) but only Internet access. Your modem (which is actually a router) was probably listening for SSDP requests and choked on this meager amount packets.
    – Daniel B
    Aug 15, 2016 at 12:41
  • @DanielB: Good point: network != modem. Updated the OP accordingly.
    – fearless_fool
    Aug 15, 2016 at 23:05

1 Answer 1

Reset to default
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TaskManager pointed the way: an app called "EOSUPNPSV" was eating up 35% of the CPU. Laptop's owner confirmed that he's not using a Canon digital camera any longer. One uninstall later and everything is calm on the network.

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