RFC 1207:FYI on Questions and Answers: Answers...
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PPP option

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8. Questions about Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP) Implementations
... PPP specification is available as RFC 1171(-> 1331(-> 1548(-> 1661std51))) [9], and a PPP options specification is available as RFC 1172(-> 1332prop | 1331(-> 1548(-> 1661std51))) [10]. ...

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