NAT INSIDE

Discussion in 'Cisco' started by cisco_newbie, Jan 23, 2008.

  1. cisco_newbie

    cisco_newbie Guest

    hi all .
    anyone can explain what exactly NAT Inside mean.. thanks
    cisco_newbie, Jan 23, 2008
    #1
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  2. cisco_newbie

    Scooty Guest

    On Jan 23, 9:50 am, cisco_newbie <> wrote:
    > hi all .
    > anyone can explain what exactly NAT Inside mean.. thanks


    NAT Inside basically means that any traffic on the inside interface as
    specified on the interface itself will be natted to an outside
    address
    Example of the inside interface

    interface Ethernet0
    description Ethernet0
    ip address 192.168.240.1 255.255.255.0
    ip nat inside
    end

    Of course you need an IP NAT OUTSIDE for the interface on the outside,
    for example a Dialer interface in an ADSL config

    In the above example The IP NAT INSIDE takes the IP address of an
    ethernet interface on a remote PC for example, and gives it a random
    port number before going to the outside address on the real IP address
    This allows for multiple computers in a network to share the one
    public IP assigned by the ISP and the external site for example knows
    which computer on the inside requested the information from the nat
    translation table that is built on the router

    Hope that helps
    Scooty, Jan 23, 2008
    #2
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