Network testing and debugging

Network Testing and

DebuggingTCP/IP CONCEPTS, WIRING, CONFIGURATING NETWORK, PROTOCOLS

S a d e e d A m e e n P Os a d e e d a m e e n @ g m a i l . c o m

Testing and Debugging

Testing activity is carried down to find the

defect in the network and its configurations.

Identify and remove errors from computer

hardware or from network is termed as

debugging

09-03-2015sadeedameen@gmail.com

Possible points of failure

The cable is plugged into the wrong network

Host machine is plugged into the wrong network

Host machine has a bad network card

Machine is offline

The web server may not be running

Testing the IP configuration

Windows systems offer a command-line tool,

called ipconfig, that lets you find out your

computer's IP configuration

The output of this command gives the IP

configuration for each interface

a computer with two network cards and one

wireless adapter has 3 interfaces each with its

own configuration09-03-2015sadeedameen@gmail.com

Testing the IP configuration cont

The Ethernet interface connected to the local area network (network card) is not

active since the cable is disconnected, but the PPP adapter (MTS) is configured.

Machines on a same network must use a same address range (with different

addresses) and a same subnet mask

In the case of a local network, connecting machines that do not have routable

IP addresses, so-called private address ranges must be used

The default gateway refers to, when applicable, the IP address of the machine

offering internet access. DNS servers

The DNS servers must correspond to the organization's DNS servers; most of the

time these are the service provider's DNS servers

Testing the connection

To test the proper functioning of a network

Ping utility is a highly practical utility provided as a standard feature

with most operating systems.

Ping lets you send a data packet to a network computer and lets

you evaluate the response time

ping -t 192.168.0.3 Ping the IP addresses of the network's computers

ping -t Mickey Ping the computer names

Ping –t www.google.com ping a domain name

Testing the connection cont

Network Testing

Load Testing

Stress Testing

Negative Testing

Inopportune Testing

Conformance/Compliance Testing

Line Speed Testing

Performance Testing

Robustness/Security Testing

Interoperability Testing09-03-2015sadeedameen@gmail.com

Load Testing

Load testing is the process of putting demand on a system or device

and measuring its response. Load testing is performed to determine a

system's behavior under both normal and anticipated

peak loadconditions

Where a system can support testing to actual volumes we have a

performance testing service to meet your requirements.

Our network testing services provides comprehensive concurrent user

simulation of user and system traffic. This can be conducted while

concurrently generating threats and attacking traffic at high loads.

Stress Testing

Stress testing is a form of deliberately intense or thorough

testing used to determine the stability of a given nework.

It involves testing beyond normal operational capacity,

often to a breaking point, in order to observe the results

Stress testing is the process of determining the ability of a

network or device to maintain a certain level of

effectiveness under unfavorable conditions.

Stress Testing

Actions involved may include:

Running several resource-intensive applications in a single computer at

the same time

Attempting to hack into a computer and use it as a zombie to

spreadspam

Flooding a server with useless e-mail messages

Making numerous, concurrent attempts to access a single Web site

Attempting to infect a system with viruses, Trojans, spyware or

othermalware

Negative Testing

Process to verify that the device under test responds

correctly to error conditions or unacceptable input

conditions.

Negative testing can be challenging because the

number of incorrect conditions is unlimited.

Example of a negative test would be using a security

protocol for authentication with an incorrect parameter

Inopportune Testing

Process to verify that the device under test is able to

react properly when an unexpected event occurs

The event is syntactically correct, but occurs when not

expected

Inopportune testing is a specific instance of negative

protocol conformance testing.

Conformance/Compliance Testing

Testing both the capabilities and behavior of an implementation, and

checking what is observed against the conformance requirements in the

relevant International Standards.(ISO/IEC 9646-1:1994(E))

testing to see if the device under test operates according to that

requirement

This is done by creating a series of single function tests for each

requirement, resulting in thousands of tests

An example of a conformance test is to check if the “ping” command

operates correctly.

Line Speed Testing

Process of verifying that a device can operate at its rated

line speed, when the bandwidth is 100% utilized or saturated.

process of subjecting the device under test to out of

boundary conditions

For example, if the device is rated as operating at 5 Giga

bytes per second, then the device should be able to handle

incoming traffic utilizing all the available bandwidth

Performance Testing

Process of verifying that the performance of the

device under test meets an acceptable level

Performance testing is a superset of line speed

testing in which performance applies to many

aspects of a network device or application,

and not just line speed.

Robustness/Security Testing

Process of subjecting a device under test to particular input streams

The input streams may be one of three types:

Random input streams

Valid input streams

Invalid input streams

Security testing is more broadly defined to include monitoring /

surveillance and the detection of specific exploits like IP spoofing or

phishing etc

Interoperability Testing

Process of testing devices from multiple manufacturers by interacting

in such a manner as to exercise the network protocol under test

Interoperability testing is very useful in the early stages of a new

product

As products mature, interoperability testing becomes less valuable as

it does not uncover enough new bugs to warrant the cost of setting

up, configuring and managing network equipment from various

manufacturers.

Network Testing and Debugging

Penetration testing

Evaluating the security of a network by hacking.

Basically, it is an analysis of system for any potential

vulnerabilities that may result from any of the following:

Poor or improper system configuration

Known and / or unknown hardware or software

Operational weaknesses in process

Technical countermeasures

Penetration testing cont

Importance of Penetration Testing:

It prevents financial loss through from hackers or extortionists or

disgruntled employees

It prevents financial loss through unreliable business systems and

processes

From an operational perspective, penetration testing helps shape

information security strategy.

It protects your brand by avoiding loss of consumer confidence

and business reputation.

Basic Network Troubleshooting Tools

The most commonly used network tool is the ping utility

This utility is used to provide a basic connectivity test between the

requesting host and a destination host.

This is done by using the Internet Control Message Protocol (ICMP)

which has the ability to send an echo packet to a destination host

and a mechanism to listen for a response from this host

Tracert/traceroute

once the ping utility has been used to determine basic

connectivity, the tracert/traceroute utility can used to determine

more specific information about the path to the destination host

It includes the route the packet takes and the response time of

these intermediate hosts

Tracert for Windows machines and traceroute for Linux/unix

based machines

Tracert/traceroute cont

Ipconfig/ifconfig

The utilities that can be used to find out this IP configuration

information include the ipconfig utility on Windows machines and

the ifconfig utility on Linux/unix based machines.

One of the most important things that must be completed when

troubleshooting a networking issue is to find out the specific IP

configuration of the variously affected hosts

Ipconfig/ifconfig cont

Nslookup

Some of the most common networking issues revolve around issues with

Dynamic Name System (DNS) address resolution issues.

The nslookup utility can be used to lookup the specific IP address(es)

associated with a domain name. If this utility is unable to resolve this

information, there is a DNS issue

Along with simple lookup, the nslookup utility is able to query specific

DNS servers to determine an issue with the default DNS servers

configured on a host

Nslookup cont

Netstat

the current state of the active network

connections on a host

It is also possible to use the netstat utility to

determine which services on a host that is

associated with specific active ports

PuTTY/Tera Term

When connecting to a variety of different types of

equipment, a telnet, SSH or serial client is required; when

this is required both the puTTY and Tera Term programs are

able to provide these functionalities.

The selection of one over the other is strictly a personal

preference.

PuTTY/Tera Term cont

Subnet and IP Calculator

These can be used to unsure a correct IP address selection and with

this a correct IP address configuration

While this type of tool is used by senior level network engineers, much of

the information obtained from the tool becomes simpler to calculate

the longer and more experience you have in the field

Two of the more commonly used free IP calculators include

Wildpackets (Bitcricket) Network Calculator and Solarwinds Advanced

Subnet Calculator

Subnet and IP Calculator cont

Speedtest.net/pingtest.net

A very easy test that can be used to both determine the Internet bandwidth

available to a specific host and to determine the quality of an Internet

connection is the use of the tools available at the speedtest.net and

pingtest.net websites

The speedtest.net site provides the ability to determine the amount of

bandwidth that is available to a specific host at a specific point in time

This is a good tool to use when measuring how long it is going to take to

upload or download information from a local to remote host

The pingtest.net website is used to determine the quality of the connection by

measuring the ping response times and jitter amounts over a short period of

time. 09-03-2015sadeedameen@gmail.com

Speedtest.net/pingtest.net cont

This information can be used to determine a likelihood

of how well the measured connection will deal with

certain types of high demand traffic like Voice over IP

(VoIP) or gaming

Pathping/mtr

In an effort to take advantage of the benefits of both

the ping and tracert/traceroute commands, the

pathping and mtr utilities were developed

Both of these tools take the functionality and

information that can be obtained from these types of

tools and provide a more detailed single picture of the

path characteristics from a specific host to a specific

destination

Pathping/mtr->Pathping

Pathping/mtr->mtr

This utility is used to display the current status of the routing table on a host

Network testing and debugging

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