Abstract-The paper presents a performance evaluation of message broker system, Rabbit MQ in high availability -enabling and redundant configurations. Rabbit MQ is a message queuing system realizing the middleware for distributed systems that implements the Advanced Message Queuing Protocol. The scalability and high availability design issues are discussed. Since HA and performance scalability requirements are in conflict, scenarios for using clustered RabbitMQ nodes and mirrored queues are presented. The results of performance measurements are reported.
We propose procedures for autoconfiguration of multihop wireless ad-hoc networks based on DHCP protocol. The proposed mechanism provides automatic address and radio parameters set-up for nodes with multiple radio interfaces, allowing to fully automatically form and to start a wireless mesh network and to route packets. The autoconfiguration schema was implemented and tested on OpenWRT platform. The demonstration shows how multiple Mikrotik routerboard with three 802.11g interfaces can fully automatically create a multihop wireless network, assign IP addresses, radio channels. It will also include the automatic visualization of network topology by network management software. Motivation of workOur goal was to create autoconfiguration component for wireless multihop networks that provides a method for automatic network start-up, joining a node into an existing network and automatic repair of temporary connectivity outage. The main objective of this component is to simplify the node configuration process as much as possible. The autoconfiguration will provide the networks with methods to set up transmission parameters while joining a node into an operational mesh, to merge two disjoint networks, and to sustain the transmission in case of link or node failure.Although there exists some autoconfiguration algorithms designed for MANET networks [1-6] we were not able to find a procedure that fully automatically assigns the radio parameters (like channels and SSID for 802.11 networks) together with IP addresses, divides the network into IP subnets corresponding to the ad-hoc networks created and is independent of routing protocol.We propose novel autoconfiguration procedures, based on extensions to DHCP[8] server and client implementations and BOOTP [7] relays, to support both automatic and predefined configurations of multiple radio interfaces in the mesh nodes. The underlying autoconfiguration method is applicable to networks with technology heterogeneity and it is independent of routing protocol in use. To optimize the routing the autoconfiguration should partition the IP address space into subnets. The DHCP server may be preconfigured by a network operator or can be automatically started on one of the mesh nodes, to provide fully automatic network setup. The DHCP protocol is extended by adding some additional options required to configure the MANET that are transferred as vendor specific extensions and some modifications to the packet relaying procedure.The proposed autoconfiguration schema was implemented and tested in laboratory network on Linux OpenWRT[9] platform and routerboards platform manufactured by Mikrotik. Description of proposed autoconfiguration proceduresEach node has preconfigured a profile, providing information about authorization required to join the MANET (eg. WPA keys), interfaces to be used and SSID mask or other method to select radio parameters. After boot-up the node starts to scan for a networks in range. It creates a list of possible networks to which it can try to connect that are...
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