Let’s assume that you have a small office with ten or fifteen computers, and all the machines have different IP addresses. Or, let’s presume that you have a big office and you have more than fifty or ...

When my internet starts crawling, I don't just restart my router and hope for the best. I grab these three network diagnostic tools and systematically work through my network to find the real culprit.

Lifehacker has been a go-to source of tech help and life advice since 2005. Our mission is to offer reliable tech help and credible, practical, science-based life advice to help you live better.