tunneling

A transmission method used in internetworks whereby a packet of one type is encapsulated

in a packet of another type, in essence becoming the payload of the encapsulating packet. For example, an IPv6 packet can be encapsulated in an IPv4 packet in order to transit an intermediate IPv4 network, which otherwise would not accept it due to numerous incompatibilities.Tunneling is used extensively in IP-based virtual private networks (VPNs). In this application, the payload packet is encrypted and encapsulated in another packet.The encapsulating packet insulates the payload packet, shielding it from view and protecting it as it transits the network. See also encapsulate, encryption, IPv4, IPv6, packet, payload, and VPN.

• T.434
• T.434
• T5
• T.6
• T.81
• Table A-1: ADSL Maximum Data Rates
• Table A-2: ASCII Code
• Table A-3: American Wire Gauge (AWG): Select Physical Attributes
• Table C-1: Twisted-Pair Categories of Performance
• Table D-1: Digital Hierarchy: T-Carrier, E-Carrier, and J-Carrier
• Table E-1: EBCDIC Code — 0–255 Decimal Notation
• Table E-2: EBCDIC Code — 00–FF Hexadecimal Notation
• Table E-3: European Digital Hierarchy: E-Carrier
• Table E-4: Frequency Spectrum: Band Designations, Nominal Frequency Ranges, Nominal
• Table E-4: Frequency Spectrum: Band Designations, Nominal Frequency Ranges, Nominal
• Table E-5: Endianess
• Table G-1: G-Series Recommendations
• Table H-1: H.320 Related Standards Recommendations
• Table H-2: SDTV Scanning Formats
• Table H-3: Notation Comparison
• Table H-4: Selected ITU-T H-Series Recommendations
• Table I-1: Frame Relay Implementation Agreements
• Table I-2: Index of Refraction (IOR)
• Table I-3: IPv4 Address Classes
• Table I-4: Selected ITU-T I-Series Recommendations