Python with CISCO Networking

Why Programming for Network Engineer

UConfigIt believe the best network engineers in the future will be able to:
a) build their own Python scripts (or curate and modify scripts they find)
b) query the APIs for their network devices, controllers, and management systems

c) contribute to key Open Source projects that are becoming the foundation of network automation 

Why Python Programming Language 

a) It is a general purpose programming language

b) It is a scripting language

c) It is used for testing

d) It is used for debugging

e) It is used for data analysis(The best suited language after R)

f) It is used for data visualisation

g) It is used for web development(Django and flask are it’s famous web frameworks)

h) It is used for automation

i) It is used to teach and introduce computer science to students in many countries

j) It is used in big data(pySpark for apache spark)

k) It is used for embedded programming

l) It is used in robotics(Raspberry pi prefers sparks)

Let's begin

a) Basic of Python

b) Network Programming with Python

Thanks

Himanshu

Network Information Gathering(Wireshark)

Wireshark

Wireshark is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education.

Software Installation

Wireshark is open-source software and you can easy to download and easy to install.

Windows Installer

Unix and Linux Installation command

sudo apt-get update

sudo apt-get install wireshark

sudo wireshark

Note : WinPcap require for installation. WinPcap has been recognized as the industry-standard tool for link-layer network access in Windows environments, allowing applications to capture and transmit network packets bypassing the protocol stack, and including kernel-level packet filtering, a network statistics engine and support for remote packet capture.

Introduction of Wireshark

Wireshark is a GUI based software. Wireshark workstation have four type of monitoring field.

1) Traffic Filter Command Field

There are some stander filter command and user specific filter command  by using these command we can filter and operate the traffic monitoring field.

2) Traffic Monitoring Field

This traffic monitoring field is operate by user filter command. By using Traffic filter command we can monitor the real time running traffic in the network. It means all running result in Traffic Monitoring Field is dependent on traffic filter command.

3) Packet Monitoring Field

This packet monitoring field display the selected packet information which select from the traffic monitoring field. When you select the specific packet which display in traffic monitoring field then packet monitoring field display information about packet source IP and MAC and destination IP and MAC and also display about protocol TCP/UDP. Packet Monitoring Field information depends on selected packet display on Traffic Monitoring Field.

4) Data Monitoring Field

This Data Monitoring Field display the information about data which packet information has displayed on Packet Monitoring Field.

 How to use Wireshark in Real Scenario

If you have knowledge about network tap to you can easy to use the Wireshark.

Step 1 : Tap the network and connect to PC.

In case of point 2 point network we require wire tap techniques using tap device for RJ-45 and Fiber cable.

In case of broadcast domain like network switch we require a mirror port.

In case of Cisco

Switch(config)# no monitor session 1

Switch(config)# monitor session 1 source interface fastEthernet0/1

Switch(config)# monitor session 1 destination interface fastEthernet0/10 encapsulation dot1q

Switch(config)# end 

Step 2 : Now open the wire shark and monitor the traffic according to your requirement. In this blog we discuss two type of traffic monitoring. UConfigIT categories the monitoring in two part.

1. Host Monitoring - In this monitoring techniques by using administrator tool we can monitor the specific traffic generated by specific host.

2. Network Monitoring - In this monitoring techniques by using administrator tool we can monitor the specific network traffic.

Basic filter in Wireshark

According to monitoring method there are two way of monitoring filter.

Host Traffic Filter(Wire Shark)

In this monitoring method we analysis the host traffic.

Network Traffic Filter(Wire Shark)

In this monitoring method we analysis the network traffic.

Basic LAB in Wireshark

Step 1: Open the wire shark and select the traffic gateway and enter the filter icmp

Step 2: In this lab all icmp traffic generated by system and monitor by same system. All icmp traffic generated for google server.

ping -4 www.google.com

Step 3: Executed this command which given in Step 2 and monitor the traffic.

Step 4: Analyze the traffic

 Step 5: Now monitor the traffic and packet

Thanks

Himanshu

Information Gathering

A information gathering is a way of operation in which we gather the information about network topology. according to UConfigIt there are two way of information gathering for collect the network topology information.

1. Host Information Gathering
2. Network Information Gathering

1. Host Information Gathering(Nmap)

A host information gathering is way of collect the specific host information. In software market available lots of application software which we can use in host information gathering.

Example: Nmap(Network Mapper)

2. Network Information Gathering(Wireshark)

A network information gathering is way of collect the specific network information. There are lots of method which use in network information gathering.

Method 1: By using administrator tools

Example : arp table(In case of IPv4), neighbors table(In case of IPv6), Routing table(Any type of routing and static route) and others administrator tools. 

Method 2: by using third party software 

Example : Wire Shark

Thanks 

Himanshu