One of the most basic safeguards against temptation online is installing a filter that can block pornography from coming into your house. This article discusses some of the basics of setting one up for your home.

After testing several of the options out there, our favorite filter is a free one. K9 Web protection http://www.k9webprotection.com/ is the free version of an advanced corporate solution, and has more powerful options than any of the others we have tried. Recommended for any Jewish home with Internet access. 

A few recommendations for using K9:

"I have found that the installation has empowered me with willpower for a few weeks, but that if I have the password, I will end up using it eventually and reverting to old habits. I would recommend giving that password to a friend or roommate you can trust, and deleting all records of it from your computer. Configure the program so that you are sure you can get all the web sites you need, and then type in a random password, copy it into an email, and delete the sent message. What I also did was set the account email address to that friend's email address, so I can't request a new temporary password without going through him.

What I also recommend, depending on how strong your yetzer hara is, is setting it under custom to block all unrated pages. K9 has a huge database of sites rated, included many tiny ones you wouldn't imagine, so you shouldn't get locked out of imporant sites. (You can also exclude certain sites from blocking on your computer alone). From what I've found, most blockers block a lot of porn, but no one can ever be 100%. By blocking all sites except those that have been rated, you actually can get 100% impenetrability."