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Multi physical interface with same subnet

Scheduled Pinned Locked Moved General pfSense Questions
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  • J
    jahonix
    last edited by Feb 28, 2018, 8:13 PM

    @jaf:

    if it's possible with only 1 pfsense.

    Definitely no.

    @jaf:

    …it seems it's too strange to be implemented.

    It's technically not possible to do something like that with one device.

    Imagine putting two green apples on one table. Now tell your customer to "grab the green apple".
    He just doesn't know which one.
    Same for an IP packet. It just doesn't know if it should take the left or the right route to one of two devices with the exact same address. Routing doesn't work this way.

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    • J
      jaf
      last edited by Mar 1, 2018, 9:02 AM

      @jahonix:

      @jaf:

      if it's possible with only 1 pfsense.

      Definitely no.

      @jaf:

      …it seems it's too strange to be implemented.

      It's technically not possible to do something like that with one device.

      Imagine putting two green apples on one table. Now tell your customer to "grab the green apple".
      He just doesn't know which one.
      Same for an IP packet. It just doesn't know if it should take the left or the right route to one of two devices with the exact same address. Routing doesn't work this way.

      Well, if it's possible to do it on 2 devices, maybe it's possible to virtualize it on 1, no?
      But I agree you must have at least 2 IP address on the wan (like you have with 2 devices) to make the difference for the 2 green apples.
      But anyway, it's to uncommon to implement something like that all in once, so I can use 2 (in reality for my project more than 2).

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      • D
        Derelict LAYER 8 Netgate
        last edited by Mar 1, 2018, 9:09 AM

        Of course you could virtualize two pfSenses on one physical to do the same job as two physicals.

        Chattanooga, Tennessee, USA
        A comprehensive network diagram is worth 10,000 words and 15 conference calls.
        DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
        Do Not Chat For Help! NO_WAN_EGRESS(TM)

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        • J
          jaf
          last edited by Mar 1, 2018, 9:16 AM

          @Derelict:

          Of course you could virtualize two pfSenses on one physical to do the same job as two physicals.

          I wanted to say, making one VM that you call "pfsenseMulti", containing an implementation of pfsense containing all that in once, with a smart HMI like pfsense  :)

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          • J
            jahonix
            last edited by Mar 1, 2018, 10:12 AM

            @jahonix:

            It's technically not possible to do something like that with one device.

            @jaf:

            … it's to uncommon to implement something like that all in once...

            @jaf:

            …implementation of pfsense containing all that in once...

            Just out of sheer curiosity: you cannot understand or you don't want to believe that technically this is not possible?

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            • J
              jaf
              last edited by Mar 1, 2018, 10:24 AM

              I think the problem is that my English is not so good, and my explanation not clear. :(
              Or maybe I'm an idiot? I hope not.

              And yes, I don't understand how it can be technically impossible to develop a VM integrating the 2 devices solution, and developing a special HMI to control all that. After, you call this VM "pfsenseMulti".

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              • J
                johnpoz LAYER 8 Global Moderator
                last edited by Mar 1, 2018, 10:38 AM

                Huh?
                You can for sure have a VM host box and put as many Pfsense VMS on it as you your host can support from memory and horse power..

                The point is you can not have the same IP on the same network and expect it to work..  How you put them on different networks is up to you.. Be it virtual routers or physical ones.

                An intelligent man is sometimes forced to be drunk to spend time with his fools
                If you get confused: Listen to the Music Play
                Please don't Chat/PM me for help, unless mod related
                SG-4860 24.11 | Lab VMs 2.8, 24.11

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                • J
                  jaf
                  last edited by Mar 1, 2018, 10:41 AM

                  @johnpoz:

                  The point is you can not have the same IP on the same network and expect it to work..

                  Where did I say this can works???
                  Sorry again if my explanations was not clear…

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                  • J
                    johnpoz LAYER 8 Global Moderator
                    last edited by Mar 1, 2018, 10:49 AM

                    You didn't - just pointing out this fact so everyone is clear ;)  How you create the different networks is up to you.

                    An intelligent man is sometimes forced to be drunk to spend time with his fools
                    If you get confused: Listen to the Music Play
                    Please don't Chat/PM me for help, unless mod related
                    SG-4860 24.11 | Lab VMs 2.8, 24.11

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                    • J
                      JKnott
                      last edited by Mar 1, 2018, 12:06 PM

                      @jaf:

                      I think the problem is that my English is not so good, and my explanation not clear. :(
                      Or maybe I'm an idiot? I hope not.

                      And yes, I don't understand how it can be technically impossible to develop a VM integrating the 2 devices solution, and developing a special HMI to control all that. After, you call this VM "pfsenseMulti".

                      Isn't this a heck of a lot of trouble to avoid the proper solution, that is change the IP address to a different subnet?

                      PfSense running on Qotom mini PC
                      i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
                      UniFi AC-Lite access point

                      I haven't lost my mind. It's around here...somewhere...

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                      • J
                        johnpoz LAYER 8 Global Moderator
                        last edited by Mar 1, 2018, 12:13 PM

                        Or even a different IP on the same subnet ;)

                        An intelligent man is sometimes forced to be drunk to spend time with his fools
                        If you get confused: Listen to the Music Play
                        Please don't Chat/PM me for help, unless mod related
                        SG-4860 24.11 | Lab VMs 2.8, 24.11

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