Weird network behavior

amberfrancesca

Hi. There was a bug with network that I cannot reproduce, but I decided to notify the community. I have three profiles (one owner + 2 additional), Allow running in background is disabled for those two, each of them has Syncthing app, Network permission for Syncthing revoked on Owner and the third profile, the second profile does have Network for Syncthing. The case was that I switched to Owner and noticed outgoing traffic to Syncthing relays https://relays.syncthing[.]net/ (I was utilizing Packet sniffer on my Mikrotik router), which is weird, because a) it could not be Syncthing on Owner or the third profile, as Network revoked, b) it could not be the second one, because background running forbidden. After phone reboot the behavior is not reproducible anymore. ¯_(ツ)_/¯

alfred

amberfrancesca That is interesting. Are you sure the traffic was outbound? Wonder if it was inbound traffic from relays.syncthing[.]net.
When you swap profiles, the profile should stop sending traffic, but you may still see some traffic coming back from the server.

amberfrancesca

alfred
Yes, it was outbound, because Packet Sniffer allows me to set src IP address, and I set it as 192.168.X.Y, and I was sure that it's the IP address of my Pixel in DHCP settings on the phone and on the router. By the way, dst port was 22067, which indicates that the device was trying to reach those relays.

jackFang

It would be great if you could reproduce the bug then if you can submit detailed issue here https://github.com/GrapheneOS/os-issue-tracker/issues

Thank you