I saw that comment too. I wondered if perhaps it was to do with inadvertantly having Wake on LAN or similar enabled. Would a PC in standby wake up if the router was left on and a signal passed through it?
I have a broadband router [only one outlet but hardwired firewalled for business] and a Belkin router to 3 PCs. They are surge protected for both power & phone and are left permanently on, although the PCs are powered down.
I have my 3Com on all the time set to not respond to pings, Plus built in Firewall, Shields up Online Scan cannot see my Computer as says to how it responds, is that it does not exist. And would be hard to hack other than a Determined Hacker