RLC is a useful tool that performs reciprocal links checking automatically. Simply tell it where the remote web pages you wish to monitor are and the URL of your links. It will crawl the remote web pages and feedback to you the latest status (found, link not found or page not found/network error). You may activate the checking as needed or setup crontab to carry out the checking once a week or so. The script can also be used to check for hackers' activities.