RFC 3682:The Generalized TTL Security Mechanism (G...
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IPv4

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1. Introduction
... Finally, the GTSM mechanism is equally applicable to both TTL (IPv4) and Hop Limit (IPv6 ...


5. Security Considerations
... GRE [RFC2784], or various forms of IPv6-in-IPv4 [RFC2893]). These cases are depicted below. ...
... IP TTL field SHOULD BE replaced with the outgoing TTL value, as defined above. In IPv4 this also requires modification of the IP header checksum ...

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