OpenWRT 101

“The router filesystem is loaded into a RAMdisk at boot, so
normally you’ll actually be working in RAM rather than directly on
the flash. This approach is beneficial because it allows you to
test things without making permanent errors (a hard reset creates a
new RAMdisk from the flash). If you want to make permanent changes
to your router’s configuration, then you can make edits to the
filesystem in the subdirectory /rom/. My recommendation is to make
changes in the RAMdisk, test them out, and if satisfied then save
the changes to the flash.”

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