Rancang Bangun Secure Mobile IP PBX Berbasis Raspberry Pi Dalam Mendukung Komunikasi Kegiatan Luar Taruna Akademi Angkatan Udara

Akademi Angkatan Udara merupakan kawah candradimuka bagi calon prajurit yangnantinya akan mencetak perwira Angkatan Udara yang Tanggon, Tanggap dan Trengginas. Dalam kegiatannya mereka melaksanakan kegiatan belajar dan berlatih baik didalam maupun diluar ksatrian. Kegiatan luar dilaksanakan dalam medan yang penuh dengan tantangan. Dalam keadaan bagaimanapun dan kondisi apapun kegiatan harus terlaksana dengan baik. Komunikasi merupakan salah satu kunci utama keberhasilan sebuah misi. Dalam penelitian ini dibuat secure mobile IP PBX berbasis raspberry pi 4. Server VoIP ini menggantikan PABX konvensional dan sebagai sarana komunikasi meskipun tidak ada sinyal internet. Perangkat yang didesain mandiri sebagi PABX lapangan yang tidak tergantung pada sebuah vendor tertentu. User menggunakan softphone yang tertanam pada smartphone. Selain itu sisi keamanan tetap menjadi faktor utama dalam menjaga kandungan isi komunikasi. Perangkat ini dilengkapi dengan protokol TLS dan ZRTP untuk mencegah terjadinya serangan MiTM. Pada akhirnya perangkat ini merupakan sebuah jembatan komunikasi pada saat Taruna AAU sedang melaksanakan kegiatan luar.

A Comprehensive Analysis of QoS in Wired and Wireless SDN Based on Mobile IP

Software-Defined Networking (SDN) is the new network paradigm whose primary focus is to create a dynamic, scalable and flexible network. It provides programmable functions for implementation of network configuration management. The demand for wireless network functionality is rising simultaneously. Mobility management for a large network is an issue in Internet Engineering Task Force (IETF). There are also a number of solutions to support mobility within the network. The Mobile Internet Protocol (MIP) is used for managing mobility. Furthermore, for the SDN platform, mobility adds roaming capability for mobile nodes in the software-defined wireless network (SDWN). In the wired scenario, SDN has different capabilities to deliver network services according to the fixed node. This study provides a quality of service (QoS) analysis in both SDN and SDWN. Mininet WiFi and RYU network emulator as a controller is used to implement the mobility API. The random walk model is applied as mobility functionality toward the final nodes. Moreover, several QoS measurement matrices are analyzed according to the network topology. At the end, round trip time (RTT), cumulative distributed function (CDF), packet loss and throughput are analyzed for quality of service comparable in the SDN and SDWN scenarios according to the MIP.

Evaluation of Routing Performance using OSPF and Multi-Controller Based Network Architecture

Newer mobile applications are increasingly being defined using Internet Protocol, resulting in increased use of Internet Protocol and subsequent upsurge of smartphones. However, many communication service provider core networks continue to use classical routing protocols and single controller-based networks if deployed. Controller-based networks built on the foundation of software-defined networks include centralization and separation of control plane and data plane, which can address the challenges experienced with the classical routing protocols. When single controllers are used, they tend to get overloaded with traffic. The ability to use multi-controller-based network architecture to improve quality of service in the mobile IP core network is still an open issue. This paper presents a performance evaluation of multi-controller-based network architecture, running OpenFlow and Open Shortest Path First protocol. The long-term evolution simulated network architecture is created using well-known network simulator Objective Modular Network Testbed running OpenFlow and simuLTE add-on. We test and analyze data traffic for Packet data ratio and Jitter and their associated effects on a multi-controller-based network running OpenFlow versus OSPF on a mobile core network. The experiment created two topologies; multi controller-based and Open Shortest path first network. Video and ping traffic is tested by the generation of traffic from User Equipment to the networkbased server in the data center and back, and traffic metrics recorded on an inbuilt integrated development environment. The simulation setup consisted of an OpenFlow controller, HyperFlow algorithm, OpenFlow switches, and Open Shortest Path First routers. The multi-controller-based network improved Jitter by 10 ms. The Open Shortest Path first showed packet data ratio values of 89% gain while the controller-based network registered a value of 86%. A standard deviation test revealed 0.7%, which shows that the difference is not significant when testing for Packet data ratio. We provided insight into the performance of multi-controller-based architecture and Open Shortest Path First protocol in the communication service provider's core network.

KRAP tethers IP3 receptors to actin and licenses them to evoke cytosolic Ca2+ signals

Regulation of IP3 receptors (IP3Rs) by IP3 and Ca2+ allows regenerative Ca2+ signals, the smallest being Ca2+ puffs, which arise from coordinated openings of a few clustered IP3Rs. Cells express thousands of mostly mobile IP3Rs, yet Ca2+ puffs occur at a few immobile IP3R clusters. By imaging cells with endogenous IP3Rs tagged with EGFP, we show that KRas-induced actin-interacting protein (KRAP) tethers IP3Rs to actin beneath the plasma membrane. Loss of KRAP abolishes Ca2+ puffs and the global increases in cytosolic Ca2+ concentration evoked by more intense stimulation. Over-expressing KRAP immobilizes additional IP3R clusters and results in more Ca2+ puffs and larger global Ca2+ signals. Endogenous KRAP determines which IP3Rs will respond: it tethers IP3R clusters to actin alongside sites where store-operated Ca2+ entry occurs, licenses IP3Rs to evoke Ca2+ puffs and global cytosolic Ca2+ signals, implicates the actin cytoskeleton in IP3R regulation and may allow local activation of Ca2+ entry.

Integrating UMTS and mobile ad hoc networks

Although cellular networks such as GPRS (2.5G) or UMTS (3G) have achieved providing both circuit-switching and packet-switching services with wide area coverage, the mobile users are still expecting higher rates and more mobility to satisfy their needs. Integrating current network architecture with other high-speed and low-cost wireless technologies is a key challenge for migrating to 4G. The IEEE 802.11 technology which has been well-developed and widely-used in local area networks seems to be a proper choice for fulfilling users' expectations. Its ad hoc functionality further improves the mobility of the users. This research proposes an architecture to achieve the internetworking between 802.11 Mobile Ad Hoc Network (MANET) and UMTS. The key approach being applied for intersystem handovers is SGSN signaling and for ad hoc mobility management is the Mobile IP signaling. The main purpose of this research is to retrieve the best effects by integrating these two network technologies. The integration system results several important features: wide area coverage, mobility and quality of service management.

Integrating UMTS and mobile ad hoc networks

Although cellular networks such as GPRS (2.5G) or UMTS (3G) have achieved providing both circuit-switching and packet-switching services with wide area coverage, the mobile users are still expecting higher rates and more mobility to satisfy their needs. Integrating current network architecture with other high-speed and low-cost wireless technologies is a key challenge for migrating to 4G. The IEEE 802.11 technology which has been well-developed and widely-used in local area networks seems to be a proper choice for fulfilling users' expectations. Its ad hoc functionality further improves the mobility of the users. This research proposes an architecture to achieve the internetworking between 802.11 Mobile Ad Hoc Network (MANET) and UMTS. The key approach being applied for intersystem handovers is SGSN signaling and for ad hoc mobility management is the Mobile IP signaling. The main purpose of this research is to retrieve the best effects by integrating these two network technologies. The integration system results several important features: wide area coverage, mobility and quality of service management.

SMARC

Next-generation network promises to integrate cross-domain carriers; thus, infrastructure can be provided as a service. 5G-PPP's vision is directed toward solving existing 4G LTE mobility challenges that congest core networks, disrupt multimedia and data transfer in high mobility situations such as trains or cars. This research adopts 5G methodology by using software-defined networking (SDN) to propose a novel mobile IP framework that facilitates seamless handover, ensures session continuity in standard and wide area coverage, and extends residential/enterprise indoor services across carriers under service level agreement while ensuring effective offload mechanism to avoid core network congestion. Performance excels existing protocols in setup and handover delays such as eliminating out-band signaling in bearer setup/release and isolating users' packets in virtual paths. Handover across cities in wide area motion becomes feasible with lower latency than LTE handover inside city. Extending indoor services across carriers becomes equivalent to LTE bearer setup inside a single carrier's PDN.

SRMIP

Existing mobility protocols suffer from multimedia and data transfer disruption when crossing cities' boundaries by trains or cars. Session continuity in wide area motion is an officially raised goal by 5G-PPP vision. This research adopts 5G methodology by using software defined networking to propose a new mobile IP framework that facilitates seamless handover and ensures session continuity in standard and wide area coverage. The same uninterruptible experience is used to extend smart indoor services with effective offload mechanism to avoid core network congestion. Performance excels existing protocols in setup and handover delays as of eliminating 4G LTE bearer setup/release out-band signaling and isolating user's packets in OpenFlow virtual path that is recursively established in-line with IP address allocation. Handover cross cities in wide area motion becomes feasible with lower latency than LTE handover inside city. Throughput is instantly restored after handover while standard packets are wire speed forwarded as of tunnel headers' elimination and OpenFlow hardware abstraction.