Network Scanning and Enumeration

Automated Way

Using enum4linux

Network Enumeration Tool

GitHub - CiscoCXSecurity/enum4linux: enum4Linux is a Linux alternative to enum.exe for enumerating data from Windows and Samba hostsGitHub

enum4linux -a <target_IP>

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Host Discovery - to find other hosts/machines in the network

Using netdisocver

Used to scan for live hosts on the network

netdiscover -i eth0 # ( netdiscover -i <interface_name> )

Using nmap

Description	Command
Ping Sweep [ Scanning Network for Live Hosts ]	nmap -sP 192.168.18.1/24
ARP Scan [ Scanning for Live Hosts without port scan in same subnet ]	nmap -sn -PR 192.168.18.0-255 or nmap -sn -PR 192.168.18.1/24
UDP ping scan	nmap -sn -PU 192.168.18.110
ICMP echo ping scan	nmap -sn -PE 192.168.18.1-255
Mask ping scan ( use if ICMP is blocked )	nmap -sn -PM 192.168.18.1-255
ICMP timestamp scan	nmap -sn -PP 192.168.18.1-255
TCP SYN Ping scan	nmap -sn -PS 192.168.18.1-255
IP Protocol scan ( uses different protocols to test connectivity )	nmap -sn -PP 192.168.18.1-255

Using Angry IP Scanner

Angry IP Scanner - the original IP scanner for Windows, Mac and Linux

• Preference → Pinging Method → Combined UDP + TCP

• Display → only live hosts

• Start

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Service Discovery - To identify open ports and services running on target

Using nmap

Description	Command
All Open Ports	nmap -p- 192.168.18.1
Specific Port	nmap -p <PORT> 192.168.18.1
Service + Version	nmap -sS -sV 192.168.18.1
Scripts + Version	nmap -sC -sV 192.168.18.1

Using hping3

hping3 -S 192.168.18.110 -p 80 -c 5

• -S - TCP Stealth Scan

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OS Discovery - Identify the OS running on the target

Using nmap

Services + OS Discovery

sudo nmap -sS -O 192.168.18.1

Using nmap nse scripts

sudo nmap --script smb-os-discovery.nse 192.168.18.110

Banner Grabbing

Based the ttl value present the ping response.

• ping 192.168.18.110

Operating System	Time To Live ( ttl )	TCP Window Size
Linux	64	5840
FreeBSD	64	65535
OpenBSD	255	16384
Windows	128	65,535 bytes to 1 GB
Cisco Routers	255	4128
Solaris	255	8760
AIX	255	16384

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Aggressive Scanning

nmap -A -v -T4 192.168.18.1

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Comprehensive Scanning

nmap -sC -sV -p- -A -v -T4 192.168.18.1