Public bug reported:
I'm running Kubuntu 22.04 LTS, x86_64, fully patched. I've been having
trouble the last week or two ssh'sing into the machine, and printing
from the machine when I am sitting at the keyboard. I also could not
connect to my external firewall when sitting at the keyboard.
I keep a Google Pixel 4a tethered to the USB hub for charging. The
Android phone is running Android 12, and the phone is set to "USB
Tethering". The phone is fully patched, too.
I found if I reboot the machine with the phone tethered, then the
machine uses the Android phone as the ethernet connection. It literally
calls the connection "ethernet", as if it was using the network adapter.
This is new behavior over the last week or two.
This is unexpected behavior for three reasons. First, it is new
behavior. Second, the wired gigabit ethernet connection is not used by
default. And thrid, the Android phone's connection is called "ethernet"
instead of something more meaningful like "USB" or "Android" or "wired
hotspot".
The third item ("ethernet" name when using Android phone) was misleading
enough to waste a lot of time troubleshooting the issue. I thought I had
an odd firewall issue or a mDNS issue.
The reason I was having so many troubles, like printing and ssh, is the
Android phone uses Wifi and it is on a different VLAN and subnet to keep
traffic segregated from my trusted internal network.
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It looks like I am running network-manager via systemd:
# service systemd-networkd status
● systemd-networkd.service - Network Service
Loaded: loaded (/lib/systemd/system/systemd-networkd.service; disabled;
vendor prese>
Active: inactive (dead)
Docs: man:systemd-networkd.service(8)
# service network-manager status
● NetworkManager.service - Network Manager
Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled;
vendor preset: >
Active: active (running) since Mon 2022-05-23 21:16:52 EDT; 59min ago
Docs: man:NetworkManager(8)
Main PID: 928 (NetworkManager)
Tasks: 3 (limit: 76693)
Memory: 12.0M
CGroup: /system.slice/NetworkManager.service
└─928 /usr/sbin/NetworkManager --no-daemon
...
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1975549
Title:
NetworkManager uses tethered Android phone as ethernet connection
instead of wired ethernet connection
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