/etc/default/networking is in ifupdown 0.8.17ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # Configuration for networking init script being run during
# the boot sequence
# Set to 'no' to skip interfaces configuration on boot
#CONFIGURE_INTERFACES=yes
# Don't configure these interfaces. Shell wildcards supported/
#EXCLUDE_INTERFACES=
# Set to 'yes' to enable additional verbosity
#VERBOSE=no
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