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On Ubuntu 22.04, every time a USB device is connected to the computer, the system sends IGMP and WS-Discovery packets on the network. More specifically, on a newly installed Ubuntu 22.04, connecting any USB stick or USB mouse will trigger the sending of:

  • IGMP packet to the multicast IP address 224.0.0.22
  • WS-Discovery (port 3702) packets over UDP/IPv4 and UDP/IPv6, respectively to 239.255.255.250 or ff02::c, packets which are sent out by colord-sane

This is probably similar to the issue previously mentioned here: What is colord-sane and why does it show up on lsof internet watch?

What would be expected:

  • No network traffic to be generated for local-only USB devices
  • No SANE-related sub-requests (e.g., no color profile adjustment attempts from colord) when the USB device is not a scanner

References:

Ouly
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1 Answers1

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The data that wireshark captures when a usb inserted: 239.255.255.250 UDP 649 44274 → 3702 Len=607:

http://schemas.xmlsoap.org/ws/2005/04/discovery/Probeurn:uuid:d297b7d4-5d58-bbcc-688a-c52c44fd2d61urn:schemas-xmlsoap-org:ws:2005:04:discoverywsdp:Device
lindev
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