Is automatic Wake On LAN possible with DD-WRT?

This guy might be doing what you're asking:

http://gaddgets.blogspot.com/2007/02/auto-wol-on-dd-wrt-on-linksys-wrt54gl.html

I thought I would try to set it up to wake up the computer on a Port 80 (http) access if it was in "sleep" mode. ... I would parse the syslog to detect port 80 activity. ... There is a lag now, when the computer is asleep to access a page on the computer. However I find that in most cases, the browser timeout is long enough to wake the computer up and deliver the webpage.

The script he wrote is at that link. If you're accessing on another port, change the port I suppose.

• The DD-WRT Wiki has this -- Wake-on-LAN (tutorial).
• Lifehacker: Access Your Computer Anytime and Save Energy with Wake-on-LAN
• And, CodingHorror posting -- Remotely Waking Up Your PC

I found this for WinXP on the dd-wrt forums,

if I put my box into hibernation, I wasn't able to wake it up anymore. The solution is very simple: go to Device manager (or run devmgmt.msc), select your ethernet adapter, double click on it and go to Power management tab. Check both Allow this device to bring the computer out of standby and Only allow management stations to bring computer out of standby.
If you check only the former, even simple ping wil wake you computer up!

If that does not work,
you will probably have to keep a desktop-icon to a batch/shell script for the wakeup.