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Practical Network Scanning

You're reading from Practical Network Scanning Capture network vulnerabilities using standard tools such as Nmap and Nessus

Product type Paperback

Published in May 2018

Publisher

ISBN-13 9781788839235

Length 326 pages

Edition 1st Edition

Languages

SQL

Tools

Nessus

Concepts

Network Security

Author (1):

Ajay Singh Chauhan

View More author details

Table of Contents (15) Chapters

Preface

1. Fundamental Security Concepts FREE CHAPTER

2. Secure Network Design

3. Server-Level Security

4. Cloud Security Design

5. Application Security Design

6. Threat Detection and Response

7. Vulnerability Assessment

8. Remote OS Detection

9. Public Key Infrastructure-SSL

10. Firewall Placement and Detection Techniques

11. VPN and WAN Encryption

12. Summary and Scope of Security Technologies

13. Assessment

14. Other Books you may enjoy

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Hardening your TCP/IP stack

For any given operating system, tuning of the TCP/IP stack can be performed by the system administrator. Changing the default values of TCP/IP stack variables provides another layer of protection and helps you to secure your hosts in a better way.

This is all about determining and making decisions about how many connections the server can maintain in a half-open state before TCP/IP triggers SYN flooding attack protection. This simply means that to configure the threshold value of the TCP connection, requests must be exceeded before SYN flood protection is triggered.

The following parameters can be adjusted on an operating system level to tune TCP/IP stacks. These are not only applicable to the operating system, but also to network devices such as firewalls and load balancers, which allow you to fine tune TCP stacks:

TcpMaxHalfOpen
TcpMaxHalfOpenRetried
TcpMaxPortsExhausted
TcpMaxConnectResponseRetransmissions

We will discuss DoS attacks in detail in the next section...

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Authors (1)

Singh Chauhan

Singh Chauhan

Ajay Singh Chauhan is an experienced Network and Security Architect and has been working extensively in the IT industry for 15 years. During his career, he has had varied responsibilities, ranging from looking after an entire IT infrastructure to providing network operations, implementation, and network design solutions. Ajay works almost exclusively with large-scale cloud datacenter multi-vendor technologies. He contributes to the Cisco blogging platform by providing IT Professionals with troubleshooting tips and tricks.

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