Problem
Networks receive packets from other networks. Normally a packet will contain the IP address of the computer that originally sent it. This allows devices in the receiving network to know where it came from, allowing a reply to be routed back (amongst other things).
However, a sender IP address can be faked ('spoofed'), characterising a Spoofing attack. This disguises the origin of packets sent, for example in a Denial-of-service attack.
Read more about this topic: Ingress Filtering
Famous quotes containing the word problem:
“The problem with marriage is that it ends every night after making love, and it must be rebuilt every morning before breakfast.”
—Gabriel García Márquez (b. 1928)
“Hypocrisy is the essence of snobbery, but all snobbery is about the problem of belonging.”
—Alexander Theroux (b. 1940)
“I don’t have any problem with a reporter or a news person who says the President is uninformed on this issue or that issue. I don’t think any of us would challenge that. I do have a problem with the singular focus on this, as if that’s the only standard by which we ought to judge a president. What we learned in the last administration was how little having an encyclopedic grasp of all the facts has to do with governing.”
—David R. Gergen (b. 1942)