News & Tools
- Alexa has been eavesdropping on you this whole time. (WashingtonPost.com)
- Listen to your own Alexa archive. (Amazon.com)
- Hands off my data! 15 default privacy settings you should change right now. (WashingtonPost.com)
- Two Factor Auth (2FA): List of websites and whether or not they support 2FA
- NAT Router Security Solutions: Tips & Tricks You Haven’t Seen Before
- GRC’s Link Farm
- Trello’s boards, lists, and cards enable you to organize and prioritize your projects in a fun, flexible and rewarding way.
Exam 3 Debriefing
What does a NAT router do? A NAT router creates a local area network (LAN) of private IP addresses and interconnects that LAN to the wide area network (WAN) known as the Internet. The “Network Address Translation” (NAT) performed by the router allows multiple computers (machines) connected to the LAN behind the router to communicate with the external Internet.1
- Network Address Translation (NAT) allows many inside IP addresses to be represented by some smaller number of outside/public IP addresses.
- Static NAT
- Dynamic NAT
- Port Address Translation (PAT) a.k.a. Dynamic NAT with Overload
NAT Address Designations
|Inside Local||Source host inside address before translation.|
|Outside Local||An IP address from which source host is known on the Internet. |
This is usually the address of the router interface connected to ISP—the actual Internet address.
|Inside Global||Source host address used after translation to get onto the Internet.|
This is also the actual Internet address.
|Outside Global||Address of outside destination host and, again, the real Internet address.|
- Troubleshooting NAT with Cisco IOS Commands
- show ip nat translations
- show ip nat statistics
- debug ip nat
- clear ip nat translations
- show ip nat translations
- How Network Address Translation Works
- Cisco IOS Network Address Translation Overview
- CCNA CCNP Training – No confusion with IP NAT Inside Outside Local Global
- Set up Port Address Translation (PAT) in the Cisco IOS
Lab-09: Chapter 13: Network Address Translation (NAT)
- Instructions / Errata (pdf)
- Baseline Simulation (Initial Hardware Setup)
- (Make sure to rename the pkt file, by replacing “YourLastName” and “YourFirstName”)
- Hands-on Lab 13.1
- Hands-on Lab 13.2
- Hands-on Lab 13.3
- You must be in class to get credit for completing this lab.
Tips: For Hands-on Lab 13.3:
If you’re unable to remove the GlobalNet NAT pool, because of, %Pool GlobalNet in use, cannot destroy, error, then copy the following commands, in one block, and paste them into the CLI to remove the pool. Otherwise, temporarily disable the interface to stop the error, then continue entering the appropriate commands to remove the pool.
clear ip nat translation * config t no ip nat pool GlobalNet 22.214.171.124 126.96.36.199 netmask 255.255.255.0 no ip nat inside source list 1 pool GlobalNet end
Read / Do
- CCNA Routing and Switching Study Guide 2nd Edition: Chapter 14: IPv6 (Internet Protocol 6)
- Do the: Written Lab, Review Questions at the end of the chapter.
- IPv6 Tutorial [9tut.com]
- Mastering IPv6 SLAAC Concepts and Configuration [ciscopress.com]
- College Info Geek (Podcast) (YouTube)
- Study for the Final Exam