Net Device Info

During boot, cloud-init prints a table to the serial console that summarizes the information about detected network devices and their state at that moment in time. A sample table appears as follows:

Device	Up	Address	Mask	Scope	Hw-Address
eth0	True	10.70.162.47	255.255.255.0	global	00:16:3e:1d:76:9b
eth0	True	fe80::216:3eff:fe1d:769b/64	.	link	00:16:3e:1d:76:9b
lo	True	127.0.0.1	255.0.0.0	host	.
lo	True	::1/128	.	host	.

This table may be useful to analyze scenarios where an instance fails to boot. The table is not printed in the final stage and it does not necessarily represent the network’s final state.

Why does the table show interfaces as down?

If the table shows interfaces as down, it means that they were not activated by the system before the table was printed. There are a few potential reasons this can occur. Some explanations include: the order in which the distro starts system services results in network devices being brought up after the table is printed, the supplied network configuration either implicitly or explicitly does not bring up the interfaces

The recommended troubleshooting advice is to inspect the network from the shell and confirm whether or not it matches your expected setup and follow the debugging instructions.