RFC 1457 PDF

Extending Point-to-Point Protocol (PPP) over Synchronous Optical NETwork/Synchronous Digital Hierarchy (SONET/SDH) with virtual concatenation, high order and low order payloads

The Dynamic Host Configuration Protocol for IPv6 (DHCPv6) Client Fully Qualified Domain Name (FQDN) Option

Seamless Bidirectional Forwarding Detection (S-BFD) for IPv4, IPv6, and MPLS

Stateful NAT64: Network Address and Protocol Translation from IPv6 Clients to IPv4 Servers