How to configure NAT in Cisco IOS (NAT Overloading) – Part 1


  1. Nice how-to, well written and easy to follow

    Worked first time


  2. thanks,it’s excellent,how to configure the autoconfiguration IPv6?

  3. I have a question. If you have more than 1 IP in the public outside IP pool, how do you know/assign which internal IP gets natted to which public IP?

  4. please tell me ,static routing,default routing,dynamic routing(Routing protocols),vpn,nat &also there apropriate example

  5. very good explanation. thanks a lot

  6. Dear tdma,
    If you are having multiple public IPs, then you have to specify them in NAT POOL. That public IPs from pool will automatically get assigned to private IPs.

  7. Dear tdma,
    To know which internal IP gets natted to which public IP, you can use this command:

    Router# show ip nat translations

    It will show that which private IP got mapped/natted to which public IP.

  8. Dear All,
    I have 8 public ip and whant to nat to my 4 local servers
    i have cisco 1841 router please can any one help in dng a static nat

  9. quick question….
    would it be possible to convert all of the private address to public by using the serial public ip address

    for example ip nat inside source list 10 interface s 0/0/0 overload

    since the s 0/0/0 interface already has the public address which is

    what if the addresses in the pool has changed?

  10. I had a Cisco 3825 acting as a Gateway

    I had Static IP : Example: on 0/0 using SFP gigabit port 10gb per port

    the 0/1 is set up as defult conecting to
    swtich cisco

    then I had 8 server conected in to that Cisco switch

    1st-port: Server has Local ip as
    2st-port: Server has Local ip as
    3st-port: Server has Local ip as

    How I can open port as 554,80,22… on this Cisco 3825

    let say on server 1= ip- how I open this port.


  11. gracias 😀

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