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Jon Postel Quotes

TCP implementations will follow a general principle of robustness: be conservative in what you do, be liberal in what you accept from others.

"The Robustness Principle". RFC 793, "Transmission Control Protocol", entire text of section 2.10, www.ietf.org. September 1981.

Be conservative in its sending behavior, and liberal in its receiving behavior.

RFC 791, "Internet Protocol", www.ietf.org. September 1981.