IP spoofing, also known as IP address forgery or a host file hijack, is a hijacking technique in which a cracker masquerades as a trusted host to conceal his identity, spoof a Web site, hijack browsers, or gain access to a network.

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How to prevent DDoS via IP spoofing while blocking port scan on internal network?

In an internal network, all machines are firewalled from each other. The firewal has port scan detection and blocking mechanism (say, psd module of iptables). Question: What are the ways I can block ...