Skip to main content

GRE Protocol

The Generic Routing Encapsulation (GRE), specified in [RFC2784], is an IETF standard defining multi-protocol encapsulation format that could be suitable to tunnel any network layer protocol over any network layer protocol. This concept was originally specified in [RFC 1701], which was an informational RFC. When this original protocol was moved to a standards track, the decision was made to replace it with two separate RFCs: [RFC2784] and [RFC2890]. [RFC2890] is an extension of the basic GRE header described in [RFC2784]. It was determined necessary because [RFC 2784] does not lend itself to encapsulation of PPP frames, since it does not have a sequence number in the GRE encapsulation format. This limitation was removed by adding a sequence number extension to the basic GRE header. Also, [RFC2784] does not allow for multiplexing onto the same GRE tunnel of tunneled packets belonging to different administrative entities possibly adopting overlapping private address spaces (a very useful feature for the provision of Virtual Private Networks). This limitation was also removed by adding a key field—that is, a numeric value used to uniquely identify a logically correlated flow of packets within the GRE tunnel—as an extension of the basic GRE header. These extensions to a basic GRE defined by [RFC2890] were especially useful in wireless data communications. For example, they allowed for in-sequence delivery of PPP frames over the R-P interface in CDMA2000 (see Chapters 4 and 7 for more details), and the provisioning of compulsory MVPN services.
GRE, as defined by these RFCs, is normally used in two classes of applications: the transport of different protocols between IP networks and the provision of VPN services for networks configured with potentially overlapping private address space. The GRE header key field can be used to discriminate the identity of the customer network where encapsulated packets originate. In this way, it provides a way to offer many virtual interfaces to customer networks on a single GRE tunnel endpoint. This feature allows for policy-based routing (that is, when routing decisions are not based only on the destination IP address but on the combination of a virtual interface identifier, and service desk salary the destination IP address) and relatively easy per-user network accounting. Also, a GRE header allows the identification of the type of the protocol that is being carried over the GRE tunnel, thus allowing IP networks to serve as a bearer service onto which a virtual multi-protocol network can be defined and implemented.

Comments

Post a Comment

Popular posts from this blog

5G Network Technology Performance

At the same time, as indicated by the study, information break and client experience are the two greatest system stresses. Around 33 percent of system experts said an information rupture stresses them the most over their system. Given the practically day by day information breaks, who can accuse them? In a perfect world, organize chiefs might want to see devices that consolidate system and security the executives. Notwithstanding, just around 40 percent of respondents said their association was utilizing a similar heap of apparatuses to oversee both system execution and security. Be that as it may, arrange stars are likewise being overpowered by the immense multiplication of cloud and system the executives devices. Numerous associations are attempting mixes of devices to deal with the test. System traffic investigation seems, by all accounts, to be the most ordinarily utilized, with a little more than 28 percent of system experts utilizing it to deal with their system challenge.
4 comments
Read more

Top 10 SDx and Networking Technologies

The best 10 Software-Defined Everything (SDx) and systems administration advances advertise is required to develop at a huge rate during the figure time frame. The development of this market is pushed by the approach of Internet of Things (IoT) and expansion of enormous measure of information through associated gadgets, expanding center around serious bits of knowledge, requirement for expanded business spryness and versatility, and developing volume and assortment of business information across industry verticals. This report orders the main 10 SDx and systems administration advances advertise by programming, administration, application, end-client, and district. The market for Software-Defined Networking (SDN) and Network Function Virtualization (NFV) is relied upon to develop at the most elevated rate during the estimate time frame. SDN and NFV are developing as promising systems administration advancements and are ready to rethink organizing with an imaginative methodology of is
Post a Comment
Read more

Wi-Fi 6

Wi-Fi 6, additionally called 802.11ax, is a redesign on the current most noteworthy speed Wi-Fi convention in wide use, 802.11ac. Wi-Fi 6 acquires an emotional improvement effectiveness over all current Wi-Fi groups, including more seasoned 2.4GHz frequencies. Wi-Fi 6 will likewise likely get new range in the 6GHz band in 2019 or 2020, further improving its speed. The greatest improvement that accompanies Wi-Fi 6 is that it builds the thickness of gadgets that can exist together in a solitary space, further speeding up all gadgets when there is mutiple. The new standard likewise improves execution by supporting deterministic (that is, not irregular) parcel booking, which, just as expanding the productivity of the utilization of some random band, additionally makes for sensational upgrades in power use by cell phones. Wi-Fi 6 will in the long run improve the experience for practically all  it help desk jobs near me   remote clients, from office laborers, who will find that thei
1 comment
Read more

Gig Economy Telecom Work Force