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Adding a VLAN-transparent bridge to Linux (Debian)

On my current Debian system I use VLAN tagging and I create bridges br-wan and br-lan that I use for LXC containers: auto lo br-lan br-wan iface lo inet loopback iface br-wan inet manual     ...
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ifdown: interface enp0s3 not configured. RTNETLINK answers: File exists. ifup: failed to bring up enp0s3

I have a virtual box (6.1) with ubuntu minimal. in the settings of the virtual machine in the network section, "Bridged Adapter" is selected. root@ubuntu:/home/mista# dmesg -T|head -1 [Sun ...
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How to execute a script after ppp connection establishes?

I would like to execute a ddns script every time after pppoe has started or renewed. And I have tried auto dsl-provider iface dsl-provider inet ppp pre-up /bin/ip link set enp1s0 up provider ...
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How can I figure out why my network configuration is simply ignored?

I have been running Debian 10 a.k.a. Buster without issues. My problems started when all of a sudden, network connectivity dropped. At that point, NetworkManager was active. I stopped and disabled the ...