security
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... have malicious intent and those that are merely unusual. The problem
is that making such determinations is hard. To solve this problem,
we define a security flag, known as the "evil" bit, in the IPv4
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Routers that are not intended as as security devices SHOULD NOT
examine this bit. This will allow them to pass packets at higher
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This document defines the behavior of security elements for the 0x0
and 0x1 values of this bit ...
... Security Considerations ...
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Correct functioning of security mechanisms depend critically on the
evil bit being set properly. If faulty components do not set the
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... W.R. Cheswick, S.M. Bellovin, and A.D. Rubin, "Firewalls and Internet Security: Repelling the Wily Hacker", Second Edition, Addison-Wesley, 2003. ...
... Eastlake, D., 3rd, Crocker, S. and J. Schiller, "Randomness Recommendations for Security", RFC 1750(-> 4086), December 1994. ...