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Forum Replies

  1. Hello Rene,
    Great video. I have a suggestion please. Can you start doing like a CCIE video series, many people understand better with videos and the way you explain topics is very great and straight forward, i hope you can implement this idea which will be so great. thanks


  2. Hi Ammar,

    Glad to hear you like it. About the videos, I will. My goal is to have a video for each of the tutorials I have.


  3. Rene is it possible when configuring NAT on a router on GNS3 to provide a simulation which will enable or facilitate actual translations in the NAT table without generating actual live production network traffic from a host(s)... on your lab gns3 router ...hope this makes sense

  4. Hi Rene,
    I have two questions.
    1. What is the difference between PAT and CGNAT?

    1. When using PAT, will the NAT router change the source port,no matter what source port is used by the LAN device? If yes, it should have a mapping table between host's source port and the new source port assigned by NAT router. Isn't it?
  5. Hi Rakesh,

    PAT means port address translation, this doesn't mean that the source port is always changed though. Take a look at this example:

    How to configure PAT on Cisco IOS Router

    Look for the show ip nat translations command in that lesson. You can see the source ports remain the same, the router will only change these if two hosts happen to pick the same source port number.

    CGNAT stands for Carrier Grade NAT. Some ISPs don't give their customers public IP addresses anymore but private IP addresses. The ISP will use NAT/PAT to put many customers behind a single public IP address.


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