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    OpenVPN (Site-to-Site) unable to ping/access from SiteA(Server) to SiteB(Client) LAN from Local Machine

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    • P
      PrashantRai
      last edited by

      Site A (OpenVPN Server) :
      WAN IP : 182.75.8X.17X/28
      LAN IP : 10.10.1.X/8
      Tunnel N/W : 192.168.70.0/24

      Site B (OpenVPN Client) :
      WAN IP : 106.51.22X.15X/19
      LAN IP : 10.20.1.X/12
      Tunnel N/W : 192.168.70.0/24

      Hi I'm trying to setup site to site openvpn, I followed the official doc's and also YouTube tutorials, after which connection between both the pfSense is established, tunnel network gets pinged from both the sites and even pfsense to pfsense is pinging including local machines IP address.
      But from Server side(SiteA) I'm not able to ping LAN address of Client Side(SiteB) from Local machine, but WAN address of both are reachable from local machines.

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      • johnpozJ
        johnpoz LAYER 8 Global Moderator
        last edited by johnpoz

        @PrashantRai said in OpenVPN (Site-to-Site) unable to ping/access from SiteA(Server) to SiteB(Client) LAN from Local Machine:

        LAN IP : 10.10.1.X/8
        LAN IP : 10.20.1.X/12

        Those overlap - so not sure how you expect for client to go to the other network?

        Why are the masks so large? Do you have somewhere close to 16 Million hosts on the site A, and 1 million on the other side ;)

        If you had those as /24 then you wouldn't have any issues or really just networks that don't overlap!!

        Client at site A lets say 10.10.1.100, says oh I need to talk to server over at site B at 10.20.1.42... Oh since that is in the 10.anything network must be local... So why would it send traffic to its gateway to get sent down the tunnel?

        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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        • P
          PrashantRai @johnpoz
          last edited by

          @johnpoz , thank you for replying, so then should I use different IP's ?? Such as SiteA 10 series and SiteB as 172 series range IP's ?

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          • johnpozJ
            johnpoz LAYER 8 Global Moderator
            last edited by johnpoz

            Yeah that would be one solution... with 10.x.x.x and 172.16-31.x.x, or just set the network size, ie masks so they don't overlap..

            Say 10.10.1/24 on one site and 10.20.1/24 on the other... How many devices/clients do you have in each site? Your network size should be appropriate... If you have 200 devices you don't need a /8 or /12 mask for example ;) A /23 would give you 510 addresses to work with - so plenty of room for growth, etc. if you currently have 200 for example..

            10.10.0/23 = 10.10.0.1 to 10.10.1.254

            10.10.2/23 = 10.10.2.1 to 10.10.3.254

            etc. etc..

            A /24 is very common since its very easy for human to see the network, first 3 octets... So 10.10.1.0/24 means that the 10.10.1 is the network, and that last octet 10.10.1.X is the HOST address so you have .1 to .254 to work with..

            Your current networks are HUGE, over 16 million addresses in the /8 and over 1 million in the /12 - and the whole /12 is inside the /8...

            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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            • P
              PrashantRai @johnpoz
              last edited by

              Thanks @johnpoz tomorrow morning I'll try with these IP's.

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              • johnpozJ
                johnpoz LAYER 8 Global Moderator
                last edited by johnpoz

                How many devices do you have at each site, is it a handful then /24... If its 200+ then you might think of /23 if you think in the next few years you might grow to be larger then what a /24 can handle, ie 254

                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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                • P
                  PrashantRai @johnpoz
                  last edited by

                  @johnpoz for now it's around 150 machines, which is expected to grow in future...

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                  • johnpozJ
                    johnpoz LAYER 8 Global Moderator
                    last edited by

                    well /24 gives you 254 Ips to work with... So that quite a bit of growth ;)

                    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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                    • P
                      PrashantRai @johnpoz
                      last edited by

                      @johnpoz well yeah..

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                      • P
                        PrashantRai @johnpoz
                        last edited by

                        @johnpoz thanks man it worked.
                        I was curious to know which all mask are overlapping, So I tested with some of the mask's, which are :

                        1. SiteA - 10.10.1.X/8
                          SiteB - 10.20.1.X/8 , testing didn't work out.

                        2. SiteA - 10.10.1.X/8
                          SiteB - 10.20.1.X/12 , testing didn't work out. It worked in only one direction

                        3. SiteA - 10.10.1.X/12
                          SiteB - 10.20.1.X/12 , testing worked. Both bi-direction ping/access is happening.

                        4. SiteA - 10.10.1.X/12
                          SiteB - 10.20.1.X/14 , testing worked. Both bi-direction ping/access is happening.

                        Now if you don't mind can you please brief/explain why testing 1 and 2 failed, and also how to know if IP's are overlapping!!!!

                        JKnottJ johnpozJ 2 Replies Last reply Reply Quote 0
                        • RicoR
                          Rico LAYER 8 Rebel Alliance
                          last edited by

                          http://jodies.de/ipcalc โ˜บ

                          -Rico

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                          • P
                            PrashantRai @Rico
                            last edited by

                            @Rico thank you ๐Ÿ™‚

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                            • JKnottJ
                              JKnott @PrashantRai
                              last edited by

                              @PrashantRai said in OpenVPN (Site-to-Site) unable to ping/access from SiteA(Server) to SiteB(Client) LAN from Local Machine:

                              Now if you don't mind can you please brief/explain why testing 1 and 2 failed, and also how to know if IP's are overlapping!!!!

                              In both, you actually have 10.0.0.0 /8. The other address in both examples is within that range. The /8 indicates 8 of the 32 bits are used for the network portion of the address and the other bits are for the device address. So, start with any address you wish and count the bits from the left. All the bits to that point are the network address and the rest are irrelevant. So, write out those network addresses first with all 0 to the right and again with all 1. This will show you the range of addresses that network would have.

                              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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                              • P
                                PrashantRai @JKnott
                                last edited by

                                @JKnott thank you ๐Ÿ™‚

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                                • johnpozJ
                                  johnpoz LAYER 8 Global Moderator @PrashantRai
                                  last edited by

                                  @PrashantRai said in OpenVPN (Site-to-Site) unable to ping/access from SiteA(Server) to SiteB(Client) LAN from Local Machine:

                                  also how to know if IP's are overlapping!!!!

                                  You don't understand network masks, ie subnetting - but your setting up the firewall and site to site vpn? How is this?

                                  So you rust randomly picking a mask? Where did you come up with the /12? I can understand the /8 somewhat since this is whole network for 10..

                                  I would highly suggest you do a bit of research.
                                  https://www.ittsystems.com/introduction-to-subnetting/

                                  Came up on google like first hit, looks basic enough to get you started.

                                  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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