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LinkedIn Learning

Protecting Your Network with Open Source Software

via LinkedIn Learning


Learn how to protect your network for free with open-source tools and these network-security tutorials from expert Jungwoo Ryoo.


  • Protect your network with free software
  • What you should know
  • Set up environment
1. Understanding Open-Source Software
  • What is open-source software?
  • Open-source software in networking
  • Open-source solutions in cybersecurity
  • Open-source vs. commercial software
  • Costs and savings
2. Firewalls
  • What is a firewall?
  • Host firewalls
  • Network firewalls
  • Static packet filtering vs. stateful packet inspection
3. Hosts as a Router
  • Netfilter and iptables
  • Setting up a host firewall using iptables
  • Automating Netfilter configuration
  • Understanding hosts as routers
  • Adding a network adapter
  • Testing the second adapter
  • Setting up IP forwarding
  • Changing Netfilter settings
  • Testing the router
4. Hosts as a Firewall
  • Setting up hosts as a network firewall
  • Setting up a web server
  • Port forwarding
  • Testing port forwarding
  • Understanding one-legged DMZ
  • Understanding true DMZ
  • Understanding an application proxy firewall
  • Setting up Squid
5. Packet Analysis
  • What is packet analysis?
  • ARP poisoning example
  • Packet capturing with Wireshark
  • Exploring Wireshark advanced features
  • Wireshark hands-on
6. Intrusion Detection Systems (IDS) and Vulnerability Assessment
  • What is an IDS?
  • Introducing Snort
  • Snort as a packet sniffer
  • Snort as an IDS: Establishing rules
  • Snort as an IDS: Detecting pings
  • What is a network vulnerability assessment?
  • Nessus
  • Network scanning with Nessus
7. Logging and Monitoring
  • Logging
  • Syslog-ng
  • Log forwarding: Part 1
  • Log forwarding: Part 2
  • Kiwi
  • SNMP
  • Next steps and additional resources

Taught by

Jungwoo Ryoo


4.4 rating at LinkedIn Learning based on 60 ratings

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