Generalized TTL security mechanism

The Generalized TTL Security Mechanism (GTSM) is a proposed Internet data transfer security method relying on a packet's Time to Live (IPv4) or Hop limit (IPv6) thus to protect a protocol stack from spoofing and denial of service attacks.
Introduction.
The desired purpose of this proposal is to verify whether the packet was originated by an adjacent node and to protect router infrastructure from overload-based attacks.
Implementation.
For protocols which GTSM is enabled, the following procedure is performed.
History.
Many people have been given credit for creating the idea. Among them are Paul Traina and Jon Stewart. A similar method was also proposed by Ryan McDowell.