I've been using Debian 10 (buster) XFCE most of the time but had to switch to 11 (bullseye) with GNOME.
With Debian 10 it was no issue to have 2 network adapters running for local purposes without internet. How was I doing it ?
ip addr add 10.0.0.5/24 dev adapter1 ip addr add 10.0.0.6/24 dev adapter2
After these commands you make adapter1 and 2 in the same network so they can talk to each other. But Debian 11 does not like that at all ! After 1 minute of working it deletes those ip statements and shows GNOME notification "Activation of network connection failed".
How am I supposed to tell GNOME or debian (from whichever comes the problem) that it shouldn't bother nor delete any of my created iproute2 statements ?
On the GNOME networking tab I can safely say that you cannot enable 2 adapters at once which is weird as it wants you to connect just one.
Thanks
I'm expecting adapters to talk to each other without debian or GNOME cutting the communication as it was in Debian 10.
After further analyzing. Using the iproute2 commands I wrote earlier was working ok for debian 10 but not for debian 11 as currently you have to configure everything from GNOME networking tab. After that it works as usual.