Sensible. If that were the case, a solution would rely in the capacity of the network manager to detect that the new route does not work,(and that the previous one did)
My naïve solution would be to ping a reliable server (I use 8.8.8.8) and delete the new route if it timesout. Additionally, if the new cabled connection were successful initially, but later stopped working, shouldn't the network fallback to the previous connection? A similar thing already happens when multiple dns servers are specified. 2 functionalities failed for this bug to occur. (a third one if you count my phone presenting itself as a router when it can't do that, but that's not within Ubuntu's jurisdiction... is it?) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1879211 Title: Charging my cellphone through usb breaks internet connection. Status in network-manager package in Ubuntu: Incomplete Bug description: I don't know what package is responsible for this. I entered iptables because the ip command was not recognized as a package. I use the ip route to debug internet problems. Here it is before plugging my cellphone through usb: #ip route default via 192.168.0.1 dev wlp2s0 proto dhcp metric 600 25.0.0.0/8 dev ham0 proto kernel scope link src 25.69.248.65 169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown 192.168.0.0/24 dev wlp2s0 proto kernel scope link src 192.168.0.51 metric 600 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown Here it is after I plug my cellphone #ip route default via 192.168.42.129 dev enp0s20f0u1 proto dhcp metric 100 default via 192.168.0.1 dev wlp2s0 proto dhcp metric 600 25.0.0.0/8 dev ham0 proto kernel scope link src 25.69.248.65 169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown 192.168.0.0/24 dev wlp2s0 proto kernel scope link src 192.168.0.51 metric 600 192.168.42.0/24 dev enp0s20f0u1 proto kernel scope link src 192.168.42.114 metric 100 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown So my computer is trying to access all ips using my cellphone as a router, which of course fails. the command "sudo ip route del default" followed by "sudo ip route add default via 192.168.0.1 dev wlp2s0" restores my connection. Thank you for your attention. I'm available to answer any questions and fix this bug. Reporting this bug was already effort diverted from my other tasks, so let's make this count no matter how deep it cuts. P.S: I went ahead and marked this bug as a security vulnerability because I can think of ways this can be exploited, especially if the cellphone can trigger the bug and route traffic so that the user doesn't suspect it. If you feel the security impact is small and that there are other more important security issues, feel free to unmark it and we can deal with it's usability impact, which is probably more impactful. Regards, Tomás. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: iptables 1.6.1-2ubuntu2 ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18 Uname: Linux 4.15.0-99-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.14 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun May 17 22:59:02 2020 InstallationDate: Installed on 2019-02-08 (464 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) SourcePackage: iptables UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1879211/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
