Secure Networking - A Company Network Project On Open-Source

Build & pentest a segmented network on Cumulus Linux, PacketFence NAC, clustered nftables, pfSense, VPN, 2FA & Wireshark

What you'll learn
Building up a company-grade segmented network with embeded security, ENTIRELY on Unix-like OS
Project-based learning of configuring firewall clusters on OpenSUSE Linux as well as pfSense
Learn about NAC (802.1X, EAP, EAPoL) using PacketFence to reject or accpet clients on switches
Learn underlying cluster technologies e.g. Keepalived & VRRP
Networking core fundamentals such as Traffic Tagging using VLANs, Trunking, STP, subnetting, LAG, MLAG, etc.
Learn firewall's core functionalities & be able to work with any firewall, no matter what brand
Initial to advanced configuration of Nvidia Cumulus Linux switches
Learn how head & branch offices securely communicate using IPSec site to site VPN
Practicing network segmentation, compartmentalization, & isolation
Learn how to create different VLANs in a company and control their traffic on each other
Setting up Linux based DHCP server to serve IP addresses in different VLANs
Learn network redundency methods e.g. LACP (802.3ad), balance-rr, balance-xor, etc. on Linux, pfSense and Cumulus switch
Learn how to migrate from iptables to nftables
Project-based learning of advanced pfSense firewall features
Project-based learning of packet capture & analysis using Wireshark, TShark, TermShark & TCPDump
Learn about openSUSE, AlpineLinux, Debian, Ubuntu and FreeBSD
Implement IPSec VPN on openSUSE using strongSwan
Configuring openVPN remote access for home office users
Configuring Wireguard remote access for IoT devices (key based authentication)
Learn how to harden SSH logins using two-factor authentication (2FA)
Learn virtualization using VirtualBox and GNS3
Learn most common network attacks and penetration testing technics
Requirements
No prior programming knowledge required
Basic IT & networking skills
A virtualization compatible computer
Internet connection
Passionate curiosity for learning (is a must)
Description
When it comes to open-source, the sky is the limit! In a nutshell, you learn networking and network defense in one go using only open source tools. You will build up a secure network from scratch, entirely on Linux, from switches to endpoints, clustered firewalls, servers incl. Network Access Control, shortly NAC server, are all built on a flavor of Linux OS such as openSUSE, AlpineLinux, Debian, Ubuntu, etc., or a Unix-like OS such as FreeBSD.We do not care much about vendors and logos, but practical concepts. For example, TCP/IP, networking fundamental concepts, and core network security principles using open-source, yet industry-proven products.We aim to teach you how standard networking concepts are "designed" and are also "applied" in work environments. Why a pure Linux-based network? well, besides the fact that Linux runs the world, if you learn the secure networking using Linux, Unix, and open-source tools, you will feel pretty confident when it comes to their commercial equivalents. For example, if you learn network firewalling using iptables and nftables, you won't have any issues with Cisco FirePower, FortiGate, or Juniper firewalls. As said, we are not into vendors, we are interested in standardized theoretical concepts and practical technics.  This method will give you a firm conceptual understanding of underlying technologies and ideas about how finished products like Cisco switches, Fortigate Firewalls, Cisco ISE NAC, HPE Aruba Clearpass, and so on, actually work behind the scene.In the end, you will run the most common network attacks against the network you built up yourself.Your Learning Key-Terms:VirtualizationGNS3 Lab (with Hyper-V & VirtualBox Integration)TCP/IPOSI ModelNetwork TopologiesIP SubnettingVLANTraffic TaggingTrunkingNIC TeamingLAGG (Link Aggregation)MLAG (Multi-Chassis Link Aggregation)Bond Modes: Active-Backup, 802.3ad (LACP)BridgingSpanning TreeInter-VLAN RoutingRouting & ARP TablesMAC FloodIEEE 802.1X & MAB (MAC Address Bypass)Network Access Control (NAC)PacketFence (Open Source NAC)Extensible Authentication Protocol (EAP) (EAPoL)RADIUS (FreeRADIUS)Linux Open Source NetworkingNvidia Cumulus Linux SwitchopenSUSE LinuxUbuntu LinuxAlpine LinuxFreeBSD (for pfSense & TrueNAS)Open Source Storage (FreeNAS)Linux Shell Command LineFirewallsNetfilter FrameworkPacket FilteringiptablesnftablesPacket SniffingWireshark, TShark, Termshark, and TCPDumpLinux ClusteringkeepalivedConnTrackVirtual Private Network (VPN)OpenVPNstrongSwan IPSec (swanctl)pfSense Firewall (FreeBSD)pfSense ClusterNext-Gen FirewallDemilitarized Zone (DMZ)Ethical Hacking Network Attacks and TechnicsSSH/Telnet/SMB/ BruteForce AttackMITM with Mac Spoofing AttackMITM with DHCP Spoofing AttackDOS Attack (POD, SYNFLOOD, BPDUs, CDP)VLAN Hopping Attack (Yersinia)STP AttackContent Addressable Memory (CAM) Table Overflows AttackARP spoofing, ARP cache poisoning attackNetwork Hardening Solutions

Overview

Section 1: Fundamentals 1: Building up a GNS3 Virtual Lab

Lecture 1 Skip this section if…

Lecture 2 GNS3 VM & Server, templates for Linux nodes, pfSense, Cumulus & VBox Integration

Section 2: Fundamentals 2: Networking Basics

Lecture 3 Network Topologies - Bus, Ring, Mesh and Hybrid

Lecture 4 Network Types - LAN, WLAN, WAN, SAN, MPLS and SDWAN

Lecture 5 OSI Network Model vs. TCP/IP Model

Lecture 6 Network Protocols and Services

Lecture 7 IP Addressing

Lecture 8 IP Subnetting

Lecture 9 Routing - ANDing, Default, Static, Dynamic Routes

Lecture 10 Switching - VLANs, STP, LAG and MLAG

Lecture 11 Network Architecture - 3 Tiers vs. Spine Leaf Design

Section 3: Fundamentals 3: Unix-like OS Basics

Lecture 12 50 years of Unix-like heritage: Research Unix, BSD, GNU, Linux and macOS

Lecture 13 Part 1: 50 "must-know" shell commands working on any Unix-like OS since 70s

Lecture 14 Part 2: 50 "must-know" shell commands working on any Unix-like OS since 70s

Lecture 15 Part 3: 50 "must-know" shell commands working on any Unix-like OS since 70s

Lecture 16 Part 4: 50 "must-know" shell commands working on any Unix-like OS since 70s

Lecture 17 vi basics - a ubiquitous screen-oriented text editor on any Unix-like OS

Lecture 18 net-tools and/or iproute2 - Networking tools on any Unix-like OS

Section 4: Fundamentals 4: Packet Capture Analysis using TCPDump, Wireshark and TShark

Lecture 19 Quick-tour of packet capture analysis

Lecture 20 Clarifying Wireshark vs. TShark vs. TermShark vs. TCPDump

Lecture 21 Why learning packet analysis? A use-case exposing RCE attack payload

Lecture 22 Installing Wireshark, Termshark, TShark and TCPDump on Kali Linux

Lecture 23 Installing Wireshark and TShark on MS Windows

Lecture 24 TCPDump use-cases: credentials, Cookies, headers, URL, remote packet capture

Lecture 25 Wireshark interafce walkthrough and possibilities

Lecture 26 Wireshark filters, syntax glossary, PCAP investigation, chaining, HTML rebuild

Lecture 27 TCP/IP Model revisited in Wireshark

Lecture 28 Packet analses with PCAP visualization

Lecture 29 Capturing packets on GNS3 links using Wireshark

Section 5: Company Network Project Kickoff

Lecture 30 Project requirements gathering and specifications document

Lecture 31 Project's basic shapes and colour codes in GNS3

Section 6: Adding Open Source Switches (Cumulus Linux)

Lecture 32 Nvidia Cumulus Linux - An Open-Source Linux-based Switch

Lecture 33 Headquarter - Creating physical connectivity with spine-leaf design

Lecture 34 Headquarter - Adding Alpine Linux clients

Lecture 35 Headquarter - Layer 2 Configuration - Interfaces and VLANs - Part1

Lecture 36 Headquarter - Layer 2 Configuration - Interfaces and VLANs - Part2

Lecture 37 Headquarter - Spanning Tree Protocol (STP) on Cumulus Linux switches

Lecture 38 Headquarter - Creating virtual layer 3 interfaces for management VLAN

Lecture 39 Headquarter - Configuring Bond interfaces, LAG and MLAG in Cumulus Linux - P1

Lecture 40 Headquarter - Configuring Bond interfaces, LAG and MLAG in Cumulus Linux - P2

Lecture 41 Branch Office - Network Prepration in GNS3

Lecture 42 Branch Office - Switches Trunk & Access ports, VLAN interfaces, Bonds & MLAG

Section 7: Adding 2 Firewall Clusters: Linux nftables (Keepalived VRRP) & pfSense HA (CARP)

Lecture 43 Read me first

Lecture 44 Headquarter - Create a custom VM for the openSUSE Linux Server cluster

Lecture 45 Headquarter - Change network adapters type to Paravirtualized Network I/O

Lecture 46 Headquarter - Creating bond interfaces on openSUSE Linux with LACP mode

Lecture 47 Headquarter - Troubleshooting inter-cluster Bond connectivity issues on Linux FW

Lecture 48 Headquarter - Configure MLAG on Cumulus switches for firewall cluster bond links

Lecture 49 Headquarter - Configure virtual VLAN interfaces on linux firewall cluster

Lecture 50 Headquarter - Disable IPv6 on the Linux firewalls

Lecture 51 Headquarter - Installing keepalived (VRRP) on both OpenSUSE Linux firewalls

Lecture 52 Headquarter - Configuring keepalived (VRRP) for OpenSUSE firewall HA cluster

Lecture 53 Introduction to netfilter framework - Part 1

Lecture 54 Introduction to netfilter framework - Part 2

Lecture 55 Headquarter - Change default policies of iptables chains to explicit drop

Lecture 56 Create IPTables service on openSUSE firewall cluster & TShooting the service

Lecture 57 Headquarter - Create iptables service on the slave firewall

Lecture 58 Headquarter - Providing internet to VLAN 20 using MASQUERADE NAT rules

Lecture 59 Headquarter - Configure Linux DHCP Server to assign each VLAN's own IP range

Lecture 60 Headquarter - Start creating Inter-VLAN iptables rules on OpenSUSE FW cluster

Lecture 61 Headquarter - Continue creating Inter-VLAN iptables policies on firewall cluster

Lecture 62 Headquarter - Creating iptables DNAT rules to publish web server from DMZ VLAN

Lecture 63 Headquarter - Restrict & log SSH Brute-force attacks with iptables RECENT module

Lecture 64 Headquarter - Visualize iptables rules with gressgraph

Lecture 65 Headquarter - nftables basics

Lecture 66 Headquarter - Transform iptables rules into nftables & create an nft service, P1

Lecture 67 Headquarter - Transform iptables rules into nftables & create an nft service, P2

Lecture 68 Headquarter - Restrict SSH Brute-force attacks for 5 minutes with Linux nftables

Lecture 69 Branch Office - Installing pfSense machines in GNS3

Lecture 70 Branch Office - Reassigning the interfaces and start the initial pfSense config

Lecture 71 Branch Office - Configure pfSense interfaces, LAGG, VLAN interfaces and pfSync

Lecture 72 Branch Office - Setup pfSense High-Availibity & MLAG between Cumulus and pfSense

Lecture 73 Branch Office - Configure pfSense DHCP server for clients and management VLANs

Lecture 74 Branch Office - Create aliases in pfSense and add floating & VLAN firewall rules

Lecture 75 Branch Office - Create Inter-VLAN rules from Clients and Mgmt to DMZ on pfSense

Lecture 76 Branch Office - Setup UFW on Ubuntu Web server in DMZ & test inter-VLAN access

Lecture 77 Branch Office - DNAT or Reverse NAT for web server access in DMZ from internet

Section 8: Adding Open Source VPN technologies using Strongswan IPSec, OpenVPN & Wireguard

Lecture 78 Setup Site to Site VPN between OpenSUSE Linux and pfSense using Strongswan - P1

Lecture 79 Setup Site to Site VPN between OpenSUSE Linux and pfSense using Strongswan - P2

Lecture 80 Troubleshooting Site to Site IPSec VPN between OpenSUSE Linux and pfSense

Lecture 81 Preparing OpenVPN server on pfSense - CA server, certificate & export plugin

Lecture 82 Setup OpenVPN remote access on pfSense & setup home-office Ubuntu OpenVPN client

Lecture 83 Setup WireGuard VPN between OpenSUSE firewall and Ubuntu as remote IoT client

Section 9: Adding Open Source Network Access Control (NAC) using PacketFence

Lecture 84 How NAC works? EAP, EAPoL, RADIUS, dot1x - P1

Lecture 85 How NAC works? EAP, EAPoL, RADIUS, dot1x - P2

Lecture 86 Installing PacketFence NAC Server on a Debian Linux

Lecture 87 Initializing PacketFence Web Configurator

Lecture 88 Deplying Network Access Server (NAS) and FreeRADIUS with MAB Profiles

Lecture 89 Configure IEEE 802.1X, Parking & Dynamic VLAN assignment on Cumulus Linux Switch

Section 10: Adding Two-factor authentication (2FA) to SSH servers in management VLAN

Lecture 90 Setting up 2FA for SSH server on Ubuntu jump hosts in management VLAN

Section 11: How secure did we build this network? Let's pentest it!

Lecture 91 Introduction to penetration testing for this project

Lecture 92 Reconnaissance of headquarter network using NMAP

Lecture 93 Implementing SSH brute force against headquarter using our NMAP findings

Lecture 94 ARP Poisoning attack to capture headquarter network traffic e.g. credentials

Lecture 95 DHCP starvation attack agains OpenSUSE DHCP server in headquarter (DOS attack)

Lecture 96 DHCP spoofing by Yersinia in headquarter to deviate the network gateway and DNS

Computer Students, learners and enthusiasts,IT administrators,Network engineers,Linux engineers,Cybersecurity specialists,Firewall administrators