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“> IP Masquerading ConceptsIP masquerading is a facility in the Linux kernel that can manipulate packets so that they appear to originate from addresses other than the original source. Before you think that this is some hacker tool, the masquerading is performed only during the forwarding of a packet. (It would make no sense if the router itself originates the packet or if the router were the destination of the packet.) The kernel performs some acrobatics to make the process 
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