MARITIME TACTICAL WIDE AREA NETWORKING (MTWAN ...

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Uncontrolled copy when printedUNCLASSIFIEDACP 200(B) Vol 2MULTI-MEMBER116. Multi-member links are those that connect two or more nodes, whereas a point-topointlink supports two nodes only. In a multi-member or half-duplex point-to-point link, asingle RF channel is shared. As an example, this can be achieved by a Time Division MultipleAccess (TDMA) technique. Multi-member links are further divided into two categories:Broadcast and Non-Broadcast Multiple-Access (NBMA). In a Broadcast subnet, all memberscan hear each other. UHF SATCOM is an example of a broadcast multi-member link when allmembers are within the footprint of a satellite. In a NBMA subnet, full connectivity among allmembers can not be guaranteed, that is, not every member can hear every other member. Anexample of a NBMA subnet is UHF Line-Of-Sight (LOS). Due to its movement, a membermay be out of the UHF LOS range of some, but not all, members of the subnet.117. A wide range of subnet combinations exist, some of which are shown in the Figure1–5. Communications subnets that can be employed with a MTWAN are described in Chapter7.Key:---- Multi-member linksPoint-to-point linksSHFUHFINMARSATOSPFMobile 6NOCOSPFUHFLOSOSPFMobile 5UHFLOSUHFOSPFLOSMobile 1HFOSPFOSPF HFHFMobile 2 Mobile 3OSPFMobile 4Figure 1–5 Subnet Combinations1-7UNCLASSIFIEDOriginal
Uncontrolled copy when printedUNCLASSIFIEDACP 200(B) Vol 2SECURITY ARCHITECTURE (SA)118. The security architecture is designed to promote the flow of information at the tacticallevel while abiding by Allied security policies. This can be achieved through the use of thefollowing:a. a. Allied peer-to-peer tactical communications networks that are isolatedfrom Coalition and National networks;b. b. Boundary Protection Devices (BPD) to enable the exchange ofapplications data between different security levels;c. c. Inline Network Encryptor (INE) to support Virtual Private Networks(VPN) over an existing IP infrastructure of a different security level;119. For example, an INE such as TACLANE can be used to create an allied VPN andtunnel allied IP traffic through national networks, subject to the security policy of therespective nation. Network security details can be found in Chapter 5.NODE DESCRIPTIONSGENERIC MOBILE NODE120. The generic architecture of a typical mobile node consists of the following: RFcommunication systems, modems, link cryptographic devices, a router, any necessaryinterface equipment needed to interface RF channels to the router, and a LAN. Examples ofthe RF communication systems include INMARSAT, MILSATCOM, HF and UHF. Detailsof the communication systems and their interface equipment can be found in Chapter 16. TheLAN equipment includes servers, workstations, printers and hubs on which informationresides and applications run. Examples of applications are E-mail, GCCS-M, Web servicesand Distributed Collaborative Planning (DCP) tools.121. Subject to national security policy, connection between nodes can be done via theinfrastructure provided by another IP network of a different security level. An INE willconnect the MTWAN router to the router of the other network.CONCLUSION122. The MTWAN Network Architecture is designed for low bandwidth, high latency, andmobile environments. It reflects present operational networks and continually evolves toreflect technology improvements.1-8UNCLASSIFIEDOriginal
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