TCP/IP: Architcture, Protocols, and Implementation With IPv6 and IP Security

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The vendor has also brought Webex Calling to its The vendor also released in beta software Apple's new line of iPhones made headlines for better battery life and cameras, but it's the improved security features that will Biometric authentication for mobile devices is touted for simplicity and security, but IT should be wary of particular biometric Though despite interest, this IBM unveiled the latest in its line of mainframes capable of processing 1 trillion web transactions a day. The IBM z Oracle Cloud Infrastructure is seeing early adoption from a diverse array of customers, although OCI's market share remains This was last updated in July It is also referred to as a OSI model?

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Login Forgot your password? Forgot your password? No problem! Submit your e-mail address below. We'll send you an email containing your password. Your password has been sent to:. As shown in many analyses also here , its use does not satisfactorily solve many of the problems standing on the way of providing effective service to different user groups existing in the current and still evolving Internet. Therefore many efforts are undertaken to design new network mechanisms there are not simple modifications of existing protocols, but are designed, from the very beginning, taking into account the requirements of mobile users.


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The prevailing trends take into account differentiated solutions based on a variety of virtualization techniques. The very characteristic element of many of such proposals is the introduction of mechanisms that allow the separation of the so-called upper layers from the transport network e. The transport network may be, in practice, any communication system that enables data transmission between two devices—employed solutions include both the data link such as Ethernet and network layer eg, IPv4, IPv6 technologies. Thanks to virtualization, the techniques used in the transport network, as well as its structure and configuration do not have a direct impact on the logical structure of the system as perceived by higher layers.

Additionally, all aspects of the transport network operation can be changed in a way practically invisible to them. This makes, from higher layers point of view, a highly flexible environment to implement their functionality. Another advantage is the possibility to use any, abstract identifier of the target object, which is not determined by its location in the physical structure of the network.

This is a huge advantage for handling mobile devices, as the identifier in a natural way may remain unchanged. This allows a relatively easy implementation of systems of content aware network elements content aware networks—CANs. Host identity protocol HIP [ 11 ] introduces an additional layer between the transport and network layers and assigns to the node a cryptographically generated public key. The proposed approach introduces a distinction between an identifier the public key and a node locator IP address.

In practice, instead of using the public key for addressing, the nodes use its hash values, called Host Identity Tags HITs. The binding matching between the identifier and locator is stored in dedicated network infrastructure components called Rendezvous Servers RVSs. Each node is assigned to one of RVSs that monitors its current location. Next, the CN directs the first packet of intended transmission to this specified RVS server, which retransmits it to the destination MH.

As a result of this transfer, the correspondent node and mobile station can communicate directly as exchanged datagrams contain actual IP addresses of both corresponding parties. This concept allows for the elimination of one of the most serious limitations of IP addressing, namely separates the node connection identifier ID from its current location in the structure of an IP network. In the case of classical IP network layer mechanisms, the nodes had to always obtain an IP address from the pool available at a given location, determined by the routing structure.

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In practice, any change in the location of the node, resulting in a change of its network access point, resulted in turn in the need to obtain a new IP address, and changing its identity. In addition, in its basic version, the solution does not require any modification of the network stack of end-nodes, since all mechanisms are located on access routers.

ETR unpacks the package and delivers it to the destination node.


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As a result, we have a scalable solution enabling for movement of nodes from one location to another one transparent for the upper layers, without changing their address information; this in turn offers a wide range of applications, such as improved flexibility in the use of available address pools, easier change of the location of service infrastructure elements, faster response on failures, etc. In addition, it should be noted that this solution is also a convenient tool for migration, as the network layer responsible for transferring the data can be changed without necessity to change the mechanisms of the upper layers.

Note, however, that the LISP solution is not directly mentioned as a method to support the mobility of nodes, because the area of its operation would be limited to network access routers equipped with powerful mechanisms required by this solution. This approach enables the macromobility, but on the other hand, requires implementation of the LISP-Mobility components in a MN it is not required for the CN , and also causes much larger number of mappings maintained by a Map-Server device.

The LISP architecture is also flexible and easily extensible, which could provide a platform for a greater number of additional network services. We should also note, that another solution based on similar principles, Indentifier—Locator Network Protocol, has been proposed in [ 43 ]. It accepts an abstract network protocol, based on IPv6 and splitting the IP address into separate Identifier representing a virtual or physical node and Locator being an IPv6 address prefix and describing a single IP sub-net.

Usage of these two separate names can provide an elegant integrated solution to the key issues referring to routing and mulihoming, without changing the core routing architecture, while offering incremental deployability through backwards compatibility with IPv6.


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Handover scenario in mobilityfirst architecture NA —network address, PA —port address. This solution can be thought of as a layered approach. However, GUIDs are constructed in such a way that they fulfill a number of additional functions—being, for example, a public key of a given entity and being able to indicate a network region for example, an Autonomous System where more precise information about this entity can be found.

GUIDs are then mapped to routable network addresses of data transport network, which are used to deliver data to its intended network destination. To facilitate the process in large network, the precise information about the entity current location is available only in selected network areas indicated by a GUID for example, Autonomous Systems most probable for a node to be present in.

It should also be noted that Content Aware Network mechanisms are proposed at this layer, which allow accessing resources available in multiple points of the network in an efficient manner by mapping GUID to the best of possible network addresses. Transport network addressing information for example IP address can then be added to the packet header 2. Changing network address during handover between attachment points 3, 5 causes data delivery failure 4 at a network router, which then initiates a late binding procedure to dynamically resolve the destination GUID to a new network address 6 , while concurrently buffering the incoming data in order to prevent its loss.

Mobility protocols that operate in the data link layer are typically designed only for a particular underlying protocol, but can provide better performance over the generic solutions.

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The IEEE The network layer protocols are divided into addressing or mapping -based and host-based with host-based routing. The protocols from the first group incorporate different techniques to obtain mobility via IP address modification. The host-based protocols manage mobility by managing route table entry for a specific host in the traditional routing infrastructure.

Host-based protocols introduce smaller changes to the current network architecture at a cost of limited functionality. The addressing-based protocols can in turn be split into two main categories, utilizing tunneling or address translation.

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The protocols can be also categorized by the optimization they introduce. The protocols optimized for routing or topology strive to limit the complexity of the architecture. The handover optimized protocols are designed to limit the delays introduced when registration point changes. A protocol may also be optimized for deployment in an existing network. Most of the well-developed, ready-to-deploy standards for mobility support in IP networks are network layer-based solutions.

Included in this group are both client- and network-side mechanisms, such as MIP or PMIP, along with their multiple extensions and optimizations. They can be utilized by all protocols and applications residing above the network layer, which makes them fairly universal, as far as their usage is concerned.

Depending on a particular deployment scenario, client- or network-side solution may be preferable. Network-side solutions allow client device to remain unmodified, but require extensive and widespread modification of the network infrastructure. On the other hand, client-side approach requires mobility support to be included in end-user devices, without the need for extensive network-side support.

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Recent introduction of general-purpose operating systems into mobile devices and their resulting unification make such approach practical. It should be noted, however, that strictly client-side solutions are rare, as most proposals require at least one element for example, a registration server, home agent etc.

The network-side approach allows a network operator to efficiently provide mobility support to all of its users due to transparent support for all client devices , but only within its administrative domain.

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Moreover the costs of modifying the network infrastructure can be high. A mobile device implementing client-side mobility support such as MIP, will retain it regardless of the network administrative domain in which it currently resides. Unfortunately, the client-side approach tends to be somewhat less efficient in terms of network resource utilization than network-side solutions.

Due to the described difficulties in implementing and deploying network-layer IP mobility support, a number of higher-layer solutions have been proposed. All of them require client-side modifications to function, as layers in which they operate can be absent within the communication network itself for example, a specific application-layer solution or transport-layer TCP mechanisms.

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