IP spoofing is a technique used by attackers to disguise the source of an IP packet, making it appear as if it originated from a different IP address. This can be used for a variety of malicious purposes, such as launching denial-of-service attacks, phishing attacks, and spreading malware.
There are a number of ways to avoid IP spoofing. One common method is to use a firewall to block incoming packets that appear to be coming from a spoofed IP address. Another method is to use a network intrusion detection system (NIDS) to detect and block spoofed packets. Additionally, some operating systems and applications include built-in features that can help to prevent IP spoofing.