Networking Blog

Posts Tagged ‘networks’

WatchGuard Technologies released new multifunctional device WatchGuard XTM 8 Series. XTM 8 works on high speed technology, it allows to pass 5Gb/sec for firewalls. WatchGuard XTM 8 Series is suitable for big networks with up to 5000 users capacity. When fully activated functionality of XTM 8 reaches a speed exceeding the capacity of data transmission lines – 1.2 gigabytes per second, which is a significant breakthrough for the universal threat management devices, providing protection without compromising network performance.

Usage of Firewall WatchGuard based on deep content scanning technology which includes checking stateful packets, deep packet inspection and its own proxy technology by WatchGuard technology, makes XTM 8 embodiment of advanced technologies in the field of security to protect business networks. With built-in proxy device WatchGuard XTM 8 stops literally millions of complex, fragmented and malformed packet attacks, cases of spyware and malware, denial of service and many other types of threats and attacks.

WatchGuard XTM 8 Series uses full advantages of the latest operating system WatchGuard – Fireware XTM, which protects networks by the use of innovative security features, including: checking HTTPS, security VoIP, application blocking instant messaging (IM) and Peer nodes (P2P). With Fireware XTM, WatchGuard XTM 8 included a creation of a cluster, load balancing and other enterprise-class features. In addition the XTM 8 control is spreaded through role-based access control (RBAC).

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RoamAD has announced the general availability of its converged wireless network solutions for the Taiwanese market following the grant of NCC Type Approval earlier this month.

RoamAD networks are now available in Taiwan through its partners aCure Technology and Taiwanese distributor T-COM Tech Co Ltd.

Earlier this year, T-COM completed the deployment of a multi-spectrum, infrastructure-mesh RoamAD network at a large power plant in Taiwan. The RoamAD network is used to backhaul voice traffic. Taiwan represents a significant market opportunity for RoamAD.

Internet Protocol multicast delivers UDP packets (data) to multiple receivers that have previously joined a multicast group, by efficiently routing and duplicating data at specific routers (chosen algorithmically depending on the particular scheme) that identify more than one receiver downstream in their tree. Receivers are arranged within a group, which is represented by an address, and anyone on the network can send data to that group address in order to send data to all of its members. Multicast is designed so that neither the sender nor any of the receivers take on the extra burden of making copies of the data; rather, the data is routed and duplicated at the router level, which makes it an extremely efficient form of data distribution from a source to many destinations. Multicast therefore is useful in a number of Internet applications, including video and audio conferencing, distance learning, distribution of software, stocks and quotes, and news.

The User Datagram Protocol (UDP) was proposed in 1980 and is one of the core protocols of the Internet protocol suite. Distributed applications send messages, called datagrams, to one another by specifying a destination address in the IP header. UDP is connectionless, meaning that prior relationships between nodes do not have to be set up beforehand in order to send UDP packets, as in TCP. Packets are sent out to the network and the IP routing ensures delivery to its destination if the links are congestion free. If there is congestion, packets are simply dropped. The UDP protocol therefore has no control mechanisms for guaranteeing reliability or for sequencing the ordering of the arrival of packets. Datagrams can arrive in any order or go missing enroute without notice. However, the simplicity of the protocol makes it very efficient can be far faster than TCP and for some applications, therefore, it is preferred.

An example of a range of applications that use UDP would be those situations where time-sensitive data is more important than guaranteed delivery; that is, it is better for a packet to be dropped than to be delayed. Streaming audio or video applications (e.g., Voice over IP (VoIP) or IPTV) therefore will often base their implementations on UDP. Another example concerns networks of extremely low bandwidth where TCP’s control mechanisms can be too severe and restrict the full utilisation of the network bandwidth. In such cases, UDP is often used and can be integrated with reliability at the application level also if that is desirable. Lastly, and most importantly from a discovery perspective, UDP is the basis for the multicast protocol. UDP is supported in most programming languages. For example, in the Java programming language UDP connections are implemented in java.net and are called DatagramSocket.