
Administrative access to the computer you want to sleep/wake-up.

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You do not want a computer on all the time, yet you want to use it from outside your home or office, and there is a DD-WRT-enabled device as the Internet gateway for that computer, powered on all the time.Most modern computers have the WOL feature - it might be listed under PME (Power Management Events). Wake-On-LAN (WOL) provides the ability to wake a slept/suspended, hibernating, or shut down computer, but the support for this (especially the latter) is dependent upon the hardware and BIOS/UEFI settings.

5.2 Remote Wake On LAN via Port Forwarding.
