Generic Routing Encapsulation (GRE) is a tunneling protocol designed to encapsulate a wide variety of network layer packets inside IP tunneling packets. The original packet is the payload for the final packet. The protocol is used on the Internet to secure virtual private networks. GRE was developed by Cisco and was designed to be stateless; the tunnel end-points do not monitor the state or availability of other tunnel end-points. This feature helps service providers support IP tunnels for clients, who won't know the service provider's internal tunneling architecture; and it gives clients the flexibility of reconfiguring their IP architectures without worrying about connectivity. GRE creates a virtual point-to-point link with routers at remote points on an IP internetwork.

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  • Generic Routing Encapsulation (GRE) is a tunneling protocol designed to encapsulate a wide variety of network layer packets inside IP tunneling packets. The original packet is the payload for the final packet. The protocol is used on the Internet to secure virtual private networks. GRE was developed by Cisco and was designed to be stateless; the tunnel end-points do not monitor the state or availability of other tunnel end-points. This feature helps service providers support IP tunnels for clients, who won't know the service provider's internal tunneling architecture; and it gives clients the flexibility of reconfiguring their IP architectures without worrying about connectivity. GRE creates a virtual point-to-point link with routers at remote points on an IP internetwork. One key difference between an encrypted GRE tunnel and an IPsec tunnel is the ability to make use of Multicast protocols over GRE tunnels. An example would be the use of OSPF over a GRE tunnel. GRE uses IP protocol number 47. (en)
  • GRE (англ. Generic Routing Encapsulation — общая инкапсуляция маршрутов) — протокол туннелирования сетевых пакетов, разработанный фирмой Cisco. Его основное назначение — инкапсуляция пакетов сетевого уровня сетевой модели OSI в IP пакеты. Номер протокола в IP — 47. Туннелирование подразумевает три протокола: пассажир — инкапсулированный протокол протокол инкапсуляции транспортный протокол Пример работы GRE туннеля. Между двумя маршрутизаторами A и B находится несколько маршрутизаторов, туннель позволяет обеспечить связь между сегментами сети 192. 168.1.0/24 и 192. 168.3.0/24 так, как если бы маршрутизаторы A и B были соединены прямым линком|thumb|500px|right (ru)
  • GRE (Generic Routing Encapsulation) es un protocolo para el establecimiento de túneles a través de Internet. Está definido en la RFC 1701 y RFC 1702, pudiendo transportar hasta 20 protocolos de red distintos. GRE permite emplear protocolos de encaminamiento especializados que obtengan el camino óptimo entre los extremos de la comunicación. GRE soporta la secuencialidad de paquetes y la creación de túneles sobre redes de alta velocidad. GRE permite establecer políticas de encaminamiento y seguridad. (es)
  • Generic Routing Encapsulation (GRE) on Ciscon kehittämä IP-tunnelointiprotokolla. Sen sisällä tunneloidaan tavallisesti VPN-yhteyksiä ja aivan tavallisia IP-paketteja, mutta se osaa siirtää myös multicast- ja IPv6-liikennettä. Protokolla sinällään on hyvä hyötysuhteeltaan ja monet sitä käyttävät toteutukset ovat nopeita ja tehokkaita. Valitettavasti kuitenkin protokollan tuki on edelleen monissa laitteissa keskeneräinen. Tämän takia GRE:tä käyttävät VPN-sovellukset saattavat toisinaan käyttäytyä verkosta riippuen hyvinkin ennalta-arvaamattomilla tavoilla. Yleisin ongelma on yhteyksien jumittuminen, jolloin VPN-palvelin tai asiakkaan ja palvelimen välissä oleva palomuuri voivat lakata sallimasta uusia yhteyksiä. Tällaiset virhetilanteet ovat hyvin kiusallisia ja ylläpitäjän on lähes mahdottonta havaita niitä, saati sitten korjata. (fi)
  • Das Generic Routing Encapsulation (GRE) ist ein Netzwerkprotokoll, das von der Firma Cisco Systems entwickelt wurde. Es dient dazu, andere Protokolle einzukapseln und so in Form von einem Tunnel über das Internet Protocol zu transportieren. Beispiele für GRE-Anwendungen: VPN-Verbindungen für PPTP, Aufbau von Tunneln zwischen IPv6-fähigen Netzwerken über IPv4-Infrastruktur oder Als Tunnel zwischen IPsec-Endstellen, um dynamische Routingprotokolle oder Multicastübertragungen über VPN-Grenzen fahren zu können. Als Tunnel für die Übertragung des IPX oder des AppleTalk-Protokolls. GRE verwendet die IP-Protokoll-Nummer 47, ein GRE-Header hat folgenden Aufbau: 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 ┌─┬─┬─┬─┬─┬─────┬─────────┬─────┬───────────────────────────────┐ │C│R│K│S│s│Recur│ Flags │ Ver │ Protocol Type │ ├─┴─┴─┴─┴─┴─────┴─────────┴─────┼───────────────────────────────┤ │ Checksum │ Offset │ ├───────────────────────────────┴───────────────────────────────┤ │ Key │ ├───────────────────────────────────────────────────────────────┤ │ Sequence Number │ ├───────────────────────────────────────────────────────────────┤ │ Routing │ └───────────────────────────────────────────────────────────────┘ C – Checksum Present R – Routing Present K – Key Present S – Sequence Number Present s – Strict Source Route Recur – Recursion Control Ver (Bits 13–15) – Version Number (de)
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rdfs:comment
  • Generic Routing Encapsulation (GRE) is a tunneling protocol designed to encapsulate a wide variety of network layer packets inside IP tunneling packets. The original packet is the payload for the final packet. The protocol is used on the Internet to secure virtual private networks. GRE was developed by Cisco and was designed to be stateless; the tunnel end-points do not monitor the state or availability of other tunnel end-points. This feature helps service providers support IP tunnels for clients, who won't know the service provider's internal tunneling architecture; and it gives clients the flexibility of reconfiguring their IP architectures without worrying about connectivity. GRE creates a virtual point-to-point link with routers at remote points on an IP internetwork. (en)
  • GRE (англ. Generic Routing Encapsulation — общая инкапсуляция маршрутов) — протокол туннелирования сетевых пакетов, разработанный фирмой Cisco. (ru)
  • GRE (Generic Routing Encapsulation) es un protocolo para el establecimiento de túneles a través de Internet. Está definido en la RFC 1701 y RFC 1702, pudiendo transportar hasta 20 protocolos de red distintos. (es)
  • Generic Routing Encapsulation (GRE) on Ciscon kehittämä IP-tunnelointiprotokolla. (fi)
  • Das Generic Routing Encapsulation (GRE) ist ein Netzwerkprotokoll, das von der Firma Cisco Systems entwickelt wurde. Es dient dazu, andere Protokolle einzukapseln und so in Form von einem Tunnel über das Internet Protocol (IP) zu transportieren. (de)
rdfs:label
  • Generic Routing Encapsulation (en)
  • Generic Routing Encapsulation (fr)
  • GRE (nl)
  • GRE (протокол) (ru)
  • GRE (es)
  • GRE (fi)
  • Generic Routing Encapsulation Protocol (de)
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