2.7.1 Network Monitoring System with Reference to Application Server or Application Server Monitors (ASM).
(Agomuo & Nwachukwu, 2009) analysed the architecture of Network monitoring system with reference to application server or application server monitor, they describe the system as a desktop based application, developed to assist micro company in monitoring their application servers running on their network domain to decrease downtime cost, improve staff productivity, create flexible reporting of their application servers on their network and to focus on business core among others.
The authors embarked on this work to create a system that has the ability to monitor and identify the state of application servers, and report within the shortest possible time. A system that can monitor many servers concurrently by alerting appropriate person(s) when critical events occurs, and a system whose flexibility in reporting error or problem on the application server can not only be display on the screen but also by audio signals.
The control centre contains the operational environment with five main
menu that is seen when you log in. these main menus are file, edit,
monitor, log and help. The input to the system comes in two major ways:
First, is the operator’s registration. Here the user is required to fill
in his/her information in the registration input specification form.
The data supplied will be used to configure the individual access to the
system, that is, user ID and password. The second is the application
server configuration settings which are divided into two forms: request
for HTTP server and request for TCP server configuration. The output can
be displayed on the screen, printed or recorded. The recording aspect
is because the system will have an alert mechanism which will inform
unique sound which can easily be identified by the operator. In the
output menu you have the name, activity and state. At the main
interface, the operator wishes to perform some operations on the server
he/she wants to monitor. These could be, start all the monitors, stop
all monitors, add monitors, remove all monitor, actions.
This work,
Network Monitoring System with Reference to application servers also
called Application server monitor (ASM) is carried out to improve the
monitoring system of organization that maybe using application servers.
At the end of this work, they were able to develop a system that can
integrate live data (application servers) on the network server which
other systems can have access to, the application detects faults on
either TCP server or HTTP server and alerts the operator by displaying
the states of the server on the screen or by making three different
sounds signifying various states of the server.
2.7.2 Network Monitoring and Lawful Intercept (Network Telemetry)
One
of the application of Network telemetry is Network Monitoring and
Lawful- Intercept, these are important to Service Providers and impose
unique requirements on network equipment, which makes network telemetry
to be the monitoring and reporting information on a network whether LAN
or WAN. (www.brocade.com/downloads/whitepapers/Network.Telemetry). It
helps to provide a system that monitors their networks for security
intrusion detection, application performance management, packet
inspection and analysis. A wide range of other applications pointed two
approaches of network architectures which a service provider can use to
design a monitoring network: In-band network architecture and
Out-of-band network architecture.
In-band network architecture: it is
based on software that must be installed on the remote system being
managed and only works after the operating system has been booted. This
solution is cheaper, but it does not allow access to Bios settings or
the reinstallation of the operating system and cannot be used to fix problems that prevent the system from booting.
Out-of-bound
network architecture: This involves the use of a dedicated management
channel for device maintenance. It allows a system administrator to
monitor and manage servers and other network equipment by remote control
regardless of whether the machine is powered on, or if an operating
system is installed or functional.
2.7.3 Network Monitoring and Diagnosis Based on Available Bandwidth Measurement.
(Ningning,
2006) analysed the architecture of Network Monitoring and Diagnosis
based on available bandwidth measurement. The researcher pointed out in
his work that Network monitoring and diagnosis systems are used by ISPs
for daily network management operations and by popular network
applications like peer-to-peer systems for performance optimization.
However, the high overhead of some monitoring and diagnostic techniques
can limit their applicability. Network monitoring and diagnosis system
periodically records value of network performance metrics in order to
measure network performance, identify performance anomalies, and
determine root causes for the problems, preferably before customers’
performance is affected.
The researcher went further to state that
end-to-end available bandwidth and bandwidth bottlenecks can be
efficiently and effectively estimated using packet-train probing
techniques, source and sink tree structures that can capture network
edge information, and with the support of a properly designed
measurement infrastructure, bandwidth-related measurements can also be
scalable and convenient enough to be used routinely by both ISPs and
regular end usersâ€. These claims are supported by four techniques
presented in his work, the (IGI/PTR) end-to-end available bandwidth
measurement technique, the Pathneck bottleneck locating technique, the
BRoute large-scale available bandwidth inference system, and the TAMI
monitoring and diagnostic infrastructure. The IGI/PTR technique
implements two available bandwidth measurement algorithms, estimating
background traffic load (IGI) and packet transmission rate (PTR),
respectively. It demonstrates that end-to-end available bandwidth can be
measured both accurately and efficiently, thus solving the path-level
available bandwidth monitoring problem.
