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Multiple Wan IP on a Single router fastethernet interface

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  • Multiple Wan IP on a Single router fastethernet interface

    Hi,


    My Scenario will be like this (Please see the attached image)

    Cloud (ISP)
    |
    Core Router
    |
    Firewall

    My Core Router Configuration as follows:

    interface FastEthernet0/0
    ip address 78.*.*.* 255.255.255.*
    duplex auto
    speed auto
    !
    interface FastEthernet0/1
    description "Connection to ISP"
    ip address 89.*.*.* 255.255.255.*
    duplex auto
    speed auto
    !

    Now We recently purchased the following Public ip as follows :
    78.*.*.* (for router)
    78.*.*.* (for Host)


    My Question is where and how can i configure the new router public ip inorder to access the public host ip?
    Attached Files

  • #2
    Re: Multiple Wan IP on a Single router fastethernet interface

    Not sure what your asking here. If you ISP allocated those ip's to you then there is nothing you need to do as they will route that ip space towards you. If you want a host on the inside to be known via that ip than you just configure a static nat translation pointing to your private ip of the host.
    CCNA, CCNA-Security, CCNP
    CCIE Security (In Progress)

    Comment


    • #3
      Re: Multiple Wan IP on a Single router fastethernet interface

      Dear auglan

      Thaks for your support, i tried as the following; still its not working

      #interface FastEthernet0/1
      #ip address 89.*.*.* 255.255.255.*
      #ip address 78.*.*.* 255.255.255.* secondary
      #no shut

      Even i tried the following but not working;

      Primary_Router_HO(config)#inte fa0/1.1
      Primary_Router_HO(config-subif)#ip address 78.*.*.* 255.255.255.*


      % Configuring IP routing on a LAN subinterface is only allowed if that
      subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,
      or ISL vLAN.


      Primary_Router_HO(config-subif)#

      Looking forward to your reply.

      Comment


      • #4
        Re: Multiple Wan IP on a Single router fastethernet interface

        What are you trying to accomplish? If you want to assign those public ip's that where issued to you, just create static nat's for your internal hosts. Your ISP assigned those addresses to you. They will route all traffic to those ip's towards your router. If you have a static nat configured your router will respond to those ip's even though they are not assigned to an interface. This is "proxy arp". There really isn't a need for secondary addressing anymore. What is the goal?
        CCNA, CCNA-Security, CCNP
        CCIE Security (In Progress)

        Comment


        • #5
          Re: Multiple Wan IP on a Single router fastethernet interface

          I have already configured the static nat in my firewall ;

          But it's not working.

          Comment


          • #6
            Re: Multiple Wan IP on a Single router fastethernet interface

            Did you add an acl entry allowing that traffic to that ip from the internet on the router and the firewall?
            CCNA, CCNA-Security, CCNP
            CCIE Security (In Progress)

            Comment


            • #7
              Re: Multiple Wan IP on a Single router fastethernet interface

              Yes i have already added everything on a firewall;

              like acl and natting for that public ip:

              But still not working ;

              please tell me the settings for core router;

              i hope you understand my problem.

              Comment


              • #8
                Re: Multiple Wan IP on a Single router fastethernet interface

                i have added the secondary ip to the fastethernet interface of my router

                now i can ping this address from my lan

                I have already added the Acl and Natting (for my local ip(10.10.3.5) to public ip)

                But not working

                iam unable to access my lan ip from outside by using the public ip (78.*.*.*)

                Comment


                • #9
                  Re: Multiple Wan IP on a Single router fastethernet interface

                  Double check your nat's and acl's are correct. Also make sure you whatever device is doing the nat knows how to route to the private networks.
                  CCNA, CCNA-Security, CCNP
                  CCIE Security (In Progress)

                  Comment


                  • #10
                    Re: Multiple Wan IP on a Single router fastethernet interface

                    Yes, I have configured acl and natting with my old public ip's ; those are working .


                    But i dont know what wrong with the new public ips;


                    I configured exactly same as old config; but unable to ping new public router ip as well as host ip..

                    Comment


                    • #11
                      Re: Multiple Wan IP on a Single router fastethernet interface

                      Without a config of all devices and addressing its impossible to tell whats going on. May be worth while hiring a consultant.
                      CCNA, CCNA-Security, CCNP
                      CCIE Security (In Progress)

                      Comment


                      • #12
                        Re: Multiple Wan IP on a Single router fastethernet interface

                        now its working fine ;(may be the problem from the provider)

                        Thank friend for your valuable time and considerations.

                        Comment

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