Sharing an Internet Connection
This is intended to allow you to use an Internet connection (working for instance with the protocol PPP) with the routing of IP packets through the machine connected to the Internet.
Routing IP packets
Suppose a class C network (254 IP) as 192.168.0.0 with a subnet mask is 255.255.255.0
To configure the gateway, you must know the number of the core 2.0, 2.1 or 2.2, 2.3 or 2.4. The tools are different. Read the rest of this entry »
The advice to avoid some of the most common mistakes that can create serious problems.
1. Redistribution of filtering
In the redistribution of routing, you need to filter properly routers. That is absolutely not to apply filters is usually a practice that creates problems for some relief, but managing a complex network filters and sketched in summary fashion is a serious difficulty for an administrator It. The best way to avoid this, obviously is to not make the redistribution. Read the rest of this entry »
In the early days, networks UTP (Unshielded Twisted Pair, unshielded cable) were considered a privileged few but today are considered a requisite. Before 15 years ago, most of the networks were based on coaxial cables and were also known as “Thin Ethernet (RJ-58) and described the specific of 10Base-2 10Base-5.
These networks support speeds up to 10 Mbps (1.2 MB / sec) in a bus topology and required a resistance of 50 ohms at each end. If any part of the bus was damaged or disconnected, the whole network could fall, causing damage and problems. Read the rest of this entry »
The network equipment supplier will cease development and manufacture of base stations for WiMax to focus on IP networks to which they are connected. Cisco had truly entered into the WiMax market in 2007 following the acquisition of Navini Networks Texans for 330 million dollars. At the time, it saw an excellent opportunity to develop broadband Internet access in emerging countries.
Since WiMax has gradually been overshadowed by the LTE (Long-Term Evolution) as a platform for future 4G mobile communication networks. LTE has the support of industry players in GSM. In addition, it is on the roadmap of the major operators have already made the choice of technology for future 4G mobile networks. Read the rest of this entry »
Historically, the proxies have been developed in two types: those in permanent line intercept traffic flowing through them and those requiring that clients are configured to use them, such as the SOCKS proxy. Each type has advantages of course, but the client configuration is tedious and expensive and therefore, if possible, should be avoided. On the other hand, try to get the proxy server directly in the path of traffic is difficult and impractical, especially if there are alternative pathways or redundant circuits. Read the rest of this entry »
Voice over Internet Protocol (VoIP) can be a huge advantage for companies of any size, but the implementation may be far from easy. VoIP creates a link between the traditional and mobile telephony.
But there may be some risks. VoIP is it to hit the most important technological invention and yet the most important mission-critical application: the telephone. Here are ten steps to run successful implementation of VoIP: Read the rest of this entry »
Voice over IP continues to collect more and more support from companies. It allows you to reduce operating costs and investments in infrastructure and also allows an increase in productivity by adding new features.
The importance of codecs
Encoding and decoding is performed by special programs, called codecs. There are different and the type used for voice is that G.729 compresses any sound in blocks lasting 10 milliseconds each. Is primarily used for VoIP conversations and encode sound at a rate of 8 Kbits per second. Read the rest of this entry »
Voice over IP (VoIP) is a set of software technologies that permit to establish and manage a communication audio not leaning to the normal telephone network, but to the Internet.
The reason for the growing interest that this technology is raising can be explained by the important benefits that its adoption can get compared to traditional telephony:
This article explains how to configure WAN protocols on a Layer 3 switch, covering both its operation and how this works in a WAN environment.
Layer 3 switching
The Layer 3 switching refers to a class of high-performance routers optimized for LANs or corporate intranets, can provide both switching and Ethernet services at wire speed. A Layer 3 switch router performs the following three main functions:
These devices are essential elements of any wired or wireless network. It is therefore essential to understand how to manage the traffic and how to set paths to follow.
As the Router enter in the OSI model
Although only a theoretical framework, the OSI model is a good way to see how all these protocols, addresses and network devices (such as just the router) complement one another.
The Layer 2 and 3 of the OSI model are those that apply in this case. The Layer 2 Data Link layer is where there exist the Ethernet protocol, the MAC addresses and switches. Layer 3, network layer, is where there exist the IP protocol, IP addresses and routers. Consider that all traffic is sent from your computer, starting from Layer 7 (application of your network) up to Layer 1 (physical layer). Through the physical layer, medium traffic flows on your network (whether wired or wireless to a network).
The traffic passes through a router only if it is not on your local LAN. Routers operate at Layer 3 but above all must interpret at least 1 to 3 layers. Many parsed routers each type of traffic up to layer 4 to 7 and in various ways, but to simplify the concept we consider that only operate at Layer 3. Read the rest of this entry »
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