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BusyBox ifup — what runs in /gns3/init.sh unless the image ships its
own ifupdown — only brings up 'auto' stanzas and rejects CIDR notation
in the address line ("don't have all variables for <iface>/inet"),
leaving the interface unconfigured after a container restart.
Document the constraint next to the ifup call and in the generated
/etc/network/interfaces sample, where addressing gets written.