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Networking setup bug in Debian 10
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netbugindeb10.md

Networking setup bug in Debian 10

Checking systemctl status networking on a fresh Debian 10 install, I saw the error:

Dec 23 15:36:50 testsrv01 ifup[628]: ifup: failed to bring up eth0

when /etc/network/interfaces had

allow-hotplug ens3
iface ens3 inet dhcp

and ip link show also came back with "ens3" as the physical interface.

Checking further, I found that /etc/network/interfaces.d/setup had

auto eth0
iface eth0 inet dhcp

Changing those references to "eth0" to "ens3" cleared the problem, as did the outright deletion of /etc/network/interfaces.d/setup.

Resources:

Startup Debian 10 error: networking.service loading failed. Answer 5 by telcoM. Unix & Linux StackExchange. July 14, 2019. Retrieved December 23, 2020.

Quality control much?

Just one more thing to "fix" when setting up a new server.

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