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Applied Network Security

You're reading from  Applied Network Security

Product type Book
Published in Apr 2017
Publisher
ISBN-13 9781786466273
Pages 350 pages
Edition 1st Edition
Languages
Authors (3):
Arthur Salmon Arthur Salmon
Profile icon Arthur Salmon
Michael McLafferty Michael McLafferty
Profile icon Michael McLafferty
Warun Levesque Warun Levesque
Profile icon Warun Levesque
View More author details
Toc

Table of Contents (18) Chapters close

Preface 1. Introduction to Network Security 2. Sniffing the Network 3. How to Crack Wi-Fi Passwords 4. Creating a RAT Using Msfvenom 5. Veil Framework 6. Social Engineering Toolkit and Browser Exploitation 7. Advanced Network Attacks 8. Passing and Cracking the Hash 9. SQL Injection 10. Scapy 11. Web Application Exploits 12. Evil Twins and Spoofing 13. Injectable Devices 14. The Internet of Things 15. Detection Systems 16. Advance Wireless Security Lab Using the Wi-Fi Pineapple Nano/Tetra 17. Offensive Security and Threat Hunting

Evading firewalls

Many firewalls and routers block or drop the ICMP (echo request and echo reply) ping. This is meant to obscure the presence of the hosts behind the firewall and protect against a possible DoS using the ping packet. When you use Nmap to scan a system or network, by default, it sends out a ping to see if the host is up. If it gets a response, it then sends the specified packets to scan the system. If the ping is blocked or dropped, Nmap gives up and says, host is down. To get around firewalls and routers that block or drop the ping, we need to suppress Nmap's default behavior of sending out that initial ping and get past the firewall that is blocking us. We can do this by using the -P0 switch. Type nmap -sS -P0 192.168.10.70:

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