Resources & Learning Materials

Comprehensive guides, tutorials, and documentation for network security, analysis, and bypassing restrictions.

Getting Started

For Beginners

Network Fundamentals

Topics Covered:
• TCP/IP Protocol Suite
• OSI Model
• DNS & DHCP
• Routing & Switching
• Network Addressing

Security Basics

Topics Covered:
• Encryption Fundamentals
• Authentication & Authorization
• Firewalls & IDS/IPS
• Secure Communications
• Common Vulnerabilities

🛠️

Essential Tools

Topics Covered:
• Command Line Basics
• Network Diagnostic Tools
• Packet Analysis
• Traffic Monitoring
• Log Analysis

Bypassing Censorship & Restrictions

VPN Configuration

OpenVPN Setup Guide

# Install OpenVPN
sudo apt-get update
sudo apt-get install openvpn

# Download configuration from your VPN provider
# Connect to VPN
sudo openvpn --config your-config.ovpn

WireGuard Quick Setup

# Install WireGuard
sudo apt install wireguard

# Generate keys
wg genkey | tee privatekey | wg pubkey > publickey

# Configure interface (replace with your details)
sudo nano /etc/wireguard/wg0.conf

Proxy Configuration

Setting up SOCKS5 Proxy

# SSH SOCKS5 Proxy
ssh -D 8080 -f -C -q -N user@remote-server

# Configure browser to use localhost:8080

Shadowsocks Client

# Install shadowsocks-libev
sudo apt-get install shadowsocks-libev

# Configure client
sudo nano /etc/shadowsocks-libev/config.json

# Start client
ss-local -c /etc/shadowsocks-libev/config.json

Network Analysis Techniques

Packet Analysis with Wireshark

Common Filters:

# Filter HTTP traffic
http

# Filter specific IP
ip.addr == 192.168.1.1

# Filter TCP on specific port
tcp.port == 443

# Follow TCP stream
tcp.stream eq 0

# Filter by protocol
dns or icmp or arp

Command Line Network Tools

Network Scanning

# Ping sweep
nmap -sn 192.168.1.0/24

# TCP SYN scan
nmap -sS target-ip

# Service detection
nmap -sV target-ip

# OS detection
nmap -O target-ip

# Comprehensive scan
nmap -A -T4 target-ip

Traffic Analysis

# Capture packets
tcpdump -i eth0 -w capture.pcap

# Read captured packets
tcpdump -r capture.pcap

# Filter by host
tcpdump host 192.168.1.1

# Filter by port
tcpdump port 80

# Monitor bandwidth usage
iftop -i eth0

Security Hardening

System Security

Firewall Configuration (iptables)

# Allow SSH
iptables -A INPUT -p tcp --dport 22 -j ACCEPT

# Allow HTTP/HTTPS
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT

# Block specific IP
iptables -A INPUT -s 10.10.10.10 -j DROP

# Save rules
iptables-save > /etc/iptables/rules.v4

SSH Hardening

# Edit SSH config
sudo nano /etc/ssh/sshd_config

# Recommended settings:
# Port 2222 (change from default 22)
# PermitRootLogin no
# PasswordAuthentication no
# PubkeyAuthentication yes
# MaxAuthTries 3

# Restart SSH
sudo systemctl restart sshd

Monitoring & Alerting

Network Monitoring Scripts

Bandwidth Monitor

#!/bin/bash
# bandwidth_monitor.sh

interface="eth0"
interval=5

while true; do
    rx1=$(cat /sys/class/net/$interface/statistics/rx_bytes)
    tx1=$(cat /sys/class/net/$interface/statistics/tx_bytes)
    sleep $interval
    rx2=$(cat /sys/class/net/$interface/statistics/rx_bytes)
    tx2=$(cat /sys/class/net/$interface/statistics/tx_bytes)
    
    rx_rate=$(( ($rx2 - $rx1) / $interval ))
    tx_rate=$(( ($tx2 - $tx1) / $interval ))
    
    echo "RX: $(( $rx_rate / 1024 )) KB/s | TX: $(( $tx_rate / 1024 )) KB/s"
done

Connection Monitor

#!/bin/bash
# connection_monitor.sh

# Monitor active connections
netstat -tan | grep ESTABLISHED | awk '{print $5}' | \
    cut -d: -f1 | sort | uniq -c | sort -rn | head -10

# Monitor listening ports
netstat -tuln | grep LISTEN

Privacy & Anonymity

Tor Network

Tor Browser Configuration

Download from official Tor Project website
Use bridges if Tor is blocked in your region
Configure SOCKS proxy: localhost:9050
Use obfs4 bridges for censorship circumvention

Tor with Applications

# Torify any application
torify application-name

# Tor SOCKS proxy
proxychains application-name

# Configure proxychains
sudo nano /etc/proxychains.conf
# Add: socks5 127.0.0.1 9050

DNS Security

DNS over HTTPS (DoH)

# Using cloudflared
wget https://github.com/cloudflare/cloudflared/releases/latest/download/cloudflared-linux-amd64
sudo mv cloudflared-linux-amd64 /usr/local/bin/cloudflared
sudo chmod +x /usr/local/bin/cloudflared

# Run as DNS proxy
cloudflared proxy-dns --port 5053 --upstream https://1.1.1.1/dns-query

Encrypted DNS (DNSCrypt)

# Install dnscrypt-proxy
sudo apt-get install dnscrypt-proxy

# Configure
sudo nano /etc/dnscrypt-proxy/dnscrypt-proxy.toml

# Start service
sudo systemctl enable dnscrypt-proxy
sudo systemctl start dnscrypt-proxy

Practice Platforms

Legal Hacking Practice

HackTheBox - Penetration testing labs
TryHackMe - Guided cybersecurity training
PentesterLab - Web penetration testing
VulnHub - Vulnerable VMs for practice
OverTheWire - War games for security

💡 Pro Tip: Always practice in legal environments. Use your own systems or authorized platforms only.

Cheat Sheets

Quick Reference

Port Numbers

20/21   - FTP
    - SSH
    - Telnet
    - SMTP
    - DNS
    - HTTP
   - HTTPS
  - MySQL
  - PostgreSQL
  - HTTP Alternate

Common Commands

# Network diagnostics
ping, traceroute, mtr, dig, nslookup

# Port scanning
nmap, masscan, unicornscan

# Packet capture
tcpdump, wireshark, tshark

# Traffic analysis
netstat, ss, iftop, nethogs

# Security testing
metasploit, burpsuite, sqlmap

More Resources

Tools Directory - Comprehensive tool listing
Blog Archive - All tutorials and guides
Latest Posts - Recent articles and updates

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