How lying helps in Internet attacks, and what you can do about it.
Networks rely on the truth.
Without accurate information, networks work poorly, if at all. But there are those who use lies to deceive networks and the systems attached to those networks. These lies can take many forms, and must be carefully crafted if they are to work at all. Source address spoofing means to lie about a packet's return address. Attackers have used this technique for many years, and the distributed denial of service attacks launched against commercial servers in February often used source address spoofing.