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    Want to Access Switch from a Different Subnet.

    Scheduled Pinned Locked Moved General pfSense Questions
    subnetrouting
    23 Posts 8 Posters 5.2k Views
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    • stephenw10S
      stephenw10 Netgate Administrator
      last edited by

      That might happen but since neither the client or the switch have an IP in the others subnet....

      Mmm, in fact that should not end up asymmtreic in that case. 🤔

      JKnottJ 1 Reply Last reply Reply Quote 0
      • johnpozJ
        johnpoz LAYER 8 Global Moderator
        last edited by johnpoz

        Im not really getting how you have this all connected together... WTF is layer 2+ ?? ;)

        Sounds a bit like your wanting to run multiple layer 3 on the same layer2? If your switch is on the the 10.10 layer 2, then it should have an IP on the 10.10, if you want to route to a different network with 192.168 - then yeah you can easy route to that.. But it needs to be a different layer 2 network.

        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

        NogBadTheBadN A 2 Replies Last reply Reply Quote 0
        • JKnottJ
          JKnott @stephenw10
          last edited by

          @stephenw10 said in Want to Access Switch from a Different Subnet.:

          That might happen but since neither the client or the switch have an IP in the others subnet....

          I assume you're referring to my post. If you set up an alias on pfSense, then it will have 2 addresses on the same network. When the computer tries to reach the switch or vice versa, pfSense will see they are on the same wire and should be able to reach the destination directly, without going through the router, and send the redirect. The only way to do this is to add an alias on the computer. That way the computer will send out the packets, with the correct address to reach the switch, with absolutely no involvement by pfSense.

          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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          • NogBadTheBadN
            NogBadTheBad @johnpoz
            last edited by

            @johnpoz said in Want to Access Switch from a Different Subnet.:

            Im not really getting how you have this all connected together... WTF is layer 2+ ?? ;)

            Sounds a bit like your wanting to run multiple layer 3 on the same layer2? If your switch is on the the 10.10 layer 2, then it should have an IP on the 10.10, if you want to route to a different network with 192.168 - then yeah you can easy route to that.. But it needs to be a different layer 2 network.

            Knew I'd seen a brand somewhere saying L2+ lol its Netgear.

            Screenshot 2019-09-17 at 15.19.07.png

            Andy

            1 x Netgate SG-4860 - 3 x Linksys LGS308P - 1 x Aruba InstantOn AP22

            JKnottJ 1 Reply Last reply Reply Quote 0
            • JKnottJ
              JKnott @NogBadTheBad
              last edited by

              @NogBadTheBad said in Want to Access Switch from a Different Subnet.:

              Knew I'd seen a brand somewhere saying L2+ lol its Netgear.

              That still doesn't say what L2+ is. Is it VLANs? Routing? Something else?

              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...

              NogBadTheBadN 1 Reply Last reply Reply Quote 0
              • stephenw10S
                stephenw10 Netgate Administrator
                last edited by

                You can route between layer 3 subnets on the same layer 2 segment. You shouldn't do it.... but you can. 😉

                However the switch would need to be using whatever VIP address you add to pfSense as it's gateway in order to have a route back. It probably doesn't have that so adding the outbound NAT rule will allow it to reply.

                I say any of this only because:
                @aeboi80 said:

                ... but for the sake of learning something...is it not possible to access the web interface of the switch at all from the 10.10.0.0 network?

                Steve

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                • NogBadTheBadN
                  NogBadTheBad @JKnott
                  last edited by

                  @JKnott said in Want to Access Switch from a Different Subnet.:

                  @NogBadTheBad said in Want to Access Switch from a Different Subnet.:

                  Knew I'd seen a brand somewhere saying L2+ lol its Netgear.

                  That still doesn't say what L2+ is. Is it VLANs? Routing? Something else?

                  I tried to look exactly what they meant by L2+, gave up after a few mins.

                  Andy

                  1 x Netgate SG-4860 - 3 x Linksys LGS308P - 1 x Aruba InstantOn AP22

                  GertjanG 1 Reply Last reply Reply Quote 0
                  • GertjanG
                    Gertjan @NogBadTheBad
                    last edited by

                    @NogBadTheBad said in Want to Access Switch from a Different Subnet.:

                    L2+

                    Easy : ISO 2 and above (?) ☺

                    No "help me" PM's please. Use the forum, the community will thank you.
                    Edit : and where are the logs ??

                    1 Reply Last reply Reply Quote 0
                    • P
                      pfSense4ME
                      last edited by

                      Layer 2 vs Layer 3: What Makes Layer 3 Switch Different?
                      When comparing the Layer 2 switch to a Layer 3 switch the first thing to look at is what additional software functionality you are getting. When a switch supports Dynamic Routing Protocols, it’s no longer a strictly Layer 2 switch. Because static routing allows traffic to be routed between VLANs. In fact, the switches that add only Static Routing to their software features are considered to be somewhere between a Layer 2 and full Layer 3 switch. Sometimes called Layer 2+ or Layer 3 Lite. Unlike Layer 2+ switch, Layer 3 switch is Dynamic Routing ,which are used to link large networks together and share routing tables between them. They can also allow for dynamic routing of multicast traffic on the network.

                      Google search:
                      layer 2 vs "layer 2+" switch

                      Source:
                      Link_Info.jpg
                      *Sorry for the pic but when I tried to input the url as a link or plain text it kept getting flagged as spam. If the link / pic is not acceptable (because it voilates a rule - apologies) please remove or correct.

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                      • A
                        aeboi80 @Gertjan
                        last edited by

                        @Gertjan Yes

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                        • A
                          aeboi80 @johnpoz
                          last edited by

                          @johnpoz said in Want to Access Switch from a Different Subnet.:

                          WT

                          This is the switch - https://www.tp-link.com/us/business-networking/smart-switch/t1600g-28ps/

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                          • stephenw10S
                            stephenw10 Netgate Administrator
                            last edited by

                            Mmm, so static routing between segments/subnets. That's layer 3 in my opinion. 😀
                            I guess I can see why they wanted some in-between label.

                            Steve

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                            • johnpozJ
                              johnpoz LAYER 8 Global Moderator
                              last edited by

                              Hehehe - dude really? There is layer 2, and then there is layer 3 ;) There is no layer 2+ heheheh

                              These stupid marketing nonsense terms.. If you want to call it layer 3 lite would be better than layer 2+

                              Where is this drawing of your network? Do you need some color+ crayons to use? ;)

                              While it is technically feasible to route multiple layer 3 on the same layer 2 - it would be the technical term BORKED if you actually do something like that ;)

                              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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                              • DerelictD
                                Derelict LAYER 8 Netgate
                                last edited by

                                A Layer 2+ switch generally has things like DHCP snooping but can't actually be configured as a router like a Layer 3 switch.

                                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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                                • johnpozJ
                                  johnpoz LAYER 8 Global Moderator
                                  last edited by johnpoz

                                  So a smart/managed layer 2 then ;)

                                  BTW, if your going to route and your wanting to access something on your downstream from a IP that is on your transit network you are always going to run into asymmetrical problems..

                                  asymmetrical.png

                                  If you want to route to other networks on your downstream, then that needs to be connected to your upstream router via a transit network.. If you going to want to get to it from devices on your transit network.. Then you need to host route on them, or you run into the above asymmetrical problem.

                                  Connect your upstream to your downstream via transit network (no hosts on it) and your asymmetrical issues are gone
                                  17216.png

                                  Also if you created your SVI on the L2 that your 10 network is on, then its IP would be in the 10 nework.. If you created put the svi on a different L2, then you need to route it via a transit or host routes or your going to have the asymmetrical problems.

                                  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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