NAT For Newbies and Not-So-Newbies: A Tutorial

Presented at DEF CON 9 (2001), July 13, 2001, 3 p.m. (50 minutes).

Network Address Translation (NAT) is a cheap and simple method for boosting the effectiveness of your firewall. Properly configured NAT can help hide your internal network structure from outsiders, enforce �outbound only� connections from internal hosts, and preserve scarce IPv4 addresses. This tutorial moves quickly through the basics, discusses a typical NAT configuration, describes NAT in action, enumerates the benefits of NAT, explains several potential pitfalls and shows how to configure DNS to accommodate the translated addresses.

Presenters:

• Barry J. Stiefel
  Barry J. Stiefel ("Stee-ful"), B.Sc., MBA, CISSP, MCSE, CCNA, CCSA/E/I, A+, is the Chief Technical Consultant at Information Engine, Inc., a Silicon Valley networking and security consulting firm. Previously, he was the founding Manager of Information Systems at Galileo Technology and was President of the Windows NT Engineering Association.

Links:

• https://defcon.org/html/defcon-9/defcon-9-speakers.html#Barry Stiefel
• https://infocon.org/cons/DEF CON/DEF CON 9/DEF CON 9 video/DEF CON 9 - Barry Stiefel - NAT for Newbies and Not-So-Newbies.mp4
• https://www.youtube.com/watch?v=eY_RYmfMRqI

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• ToorCon San Diego TwentyOne (2019) / NAT Pinning 2.0: bypassing routers & firewalls via web+NAT abuse
• ShellCon 2019 / Keynote - NAT Pinning: bypassing routers/firewalls via web+NAT abuse
• DEF CON 10 (2002) / Black Ops of TCP/IP: Work NAT, Work. Good NAT. Woof