Firewalls with Iptables

Prerequisites

• First two videos on firewalls

Summary

• Extensive coverage of iptables and iptables syntax, firewall policies, and attacks: SYN flood & ping flood (smurf attack). In the second video lecture I describe how to setup logging.  That will be a big part of your second assignment, so make sure you review the video and get your logging working!

Video 

• Configuring an IPTables firewalls

• 28:13 - nano text editor usage
• 28:58 - How to install vi (vim) in Ubuntu
• 29:15 - Review of execute permissions
• 29:35 - Using vim to edit the firewall rules shell script
• 36:24 - Review of chmod
  
• 36:53 - netstat command usage
• 37:11 - How to install vsftpd
• 37:22 - How to install openssh-server
• 37:48 - Running the firewall rules shell script
• 38:07 - Listing the active iptables firewall rules
• 38:45 - Testing FTP access with active firewall rules
• 39:33 - Testing SSH access
• 40:35 - Re-enabling SSH access
• 41:13 - Testing SSH access again (this time successful)
• 41:37 - Testing ping (accepted)
• 41:52 - Testing ping (rejected)
• Setup iptables logging 

Reference Materials

• Guide to Network Defense and Countermeasures - Chapter 11 (pgs. 439-444)
• Netfilter/iptables Documentation
• Vim Documentation
• IPTables Tutorial
  

Additional Information

• Logging
• 25 common firewall rules

All Course Lectures