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  1. #1
    Join Date
    Nov 2008

    Default Alternative NAT configuration ?

    Hi Todd

    The way I understand your guide the following would be a working example of configuring NAT Overload:

    R1(config)# int fa0/1
    R1(config-if)# ip nat inside
    R1(config-if)# int s0/1
    R1(config-if)# ip nat outside

    R1(config)# ip nat pool Todd
    R1(config)# ip nat inside source list 1 pool Todd overload
    R1(config)# access -list 1 permit

    The question I have relates to a command I've seen in a couple of other NAT examples and doesn't seem to be associated with a pool:

    Router(config)# ip nat inside source list 1 int serial 0/0 overload

    Could you briefly explain what the command specifies and in what situation it would be used rather than the initial example taken from your guide


  2. #2
    Join Date
    Mar 2008
    Winston Salem, NC


    hi, the first command " ip nat inside source list 1 pool Todd overload" uses the pool of addresses that was configured earlier, and once one address is at its maxium connections, it will assign the next address in the pool.

    the latter command " ip nat inside source list 1 int s0/0 overload" is the command to use pat on the serial0/0 interface and use port numbers to differentiate the connections.. this command takes the ip address (static or assign by the ISP dhcp server) on the interface and overload that ip address.. the difference is that the first command uses the pool of addresses you assigned, while the latter command uses the ip address already configured on the serial interface ( such as, if it has been assigned by the ISP dhcp server.)

    hope this helps.

    Cisco---------------------- CompTIA
    -CCNA ----------------------Security +

  3. #3
    Join Date
    Nov 2008


    Thanks Lildeezul

    That clears things up.


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