http://hackaday.com/2009/05/12/d-link-adds-captcha-to-routers/
I've noticed over the past month or so, someone's been trying to log on to my ADSL router - Thankfully, I'd already re-configured it from the default (which allowed both LAN and WAN logins) to disallow logins from the WAN-side (rest of the planet)... but they keep trying.
If any of this confuses you, or worries you, please comment.
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D-Link adds captcha to routers - Hack a Day