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    Not getting DHCP lease from Netgear LB1120 LTE Modem Bridged

    Scheduled Pinned Locked Moved Routing and Multi WAN
    28 Posts 3 Posters 1.9k Views
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    • M
      mrn @mrn
      last edited by

      It's not the cable either. I just used the same cable for the router and laptop.

      M 1 Reply Last reply Reply Quote 0
      • M
        michmoor LAYER 8 Rebel Alliance @mrn
        last edited by

        @mrn that’s a weird one. I would look into that system logs to see what’s going on (dhclient) with DHCP.

        Firewall: NetGate,Palo Alto-VM,Juniper SRX
        Routing: Juniper, Arista, Cisco
        Switching: Juniper, Arista, Cisco
        Wireless: Unifi, Aruba IAP
        JNCIP,CCNP Enterprise

        M 1 Reply Last reply Reply Quote 0
        • M
          mrn @michmoor
          last edited by

          @michmoor I already did that in my first post, unless you mean some other place.

          M 1 Reply Last reply Reply Quote 0
          • M
            michmoor LAYER 8 Rebel Alliance @mrn
            last edited by michmoor

            @mrn yes i see that i apologize.
            This doesnt seem like a pfsense related issue.
            DHCP is 4 message types
            Discover
            Offer
            Request
            Acknowledgement

            pfSense is sending out a broadcast looking for a dhcp server. The dhcp server (cable modem) will hear that broadcast and respond with an offer (public IP from the pool).
            From your system log messages (assuming no filtering of the log messages), pfsense is looking for the dhcp server and its not responding.
            As mentioned it could be a sticky mac address issue where the first record mac learned on the cable modem port is what will get the IP address and subsequent macs get nothing. If so and if rebooting the modem doesnt clear the mac then i would contact the service provider.

            edit: Why are you hard coding a mac address in the pfsense WAN DHCP settings?

            Firewall: NetGate,Palo Alto-VM,Juniper SRX
            Routing: Juniper, Arista, Cisco
            Switching: Juniper, Arista, Cisco
            Wireless: Unifi, Aruba IAP
            JNCIP,CCNP Enterprise

            M 1 Reply Last reply Reply Quote 0
            • M
              mrn @michmoor
              last edited by

              @michmoor

              The reason I hardcoded it is that I have an high availability setup. Right now the LTE modem is connected to my secondary pfsense, but I want to me able to move the connection to the primary if necessary. I know that having the same MAC address can make it a seamless transition.

              M 1 Reply Last reply Reply Quote 0
              • M
                mrn @mrn
                last edited by

                It won't pull an neither on bridged NOR on router mode.

                M 1 Reply Last reply Reply Quote 0
                • M
                  mrn @mrn
                  last edited by

                  @mrn And yes, I have updated it to the latest firmware version.

                  M 1 Reply Last reply Reply Quote 0
                  • M
                    michmoor LAYER 8 Rebel Alliance @mrn
                    last edited by

                    @mrn in Router mode i suspect the cable modem is giving out a DHCP address in the RFC1918 space which based on your screenshot, pfsense will ignore. Uncheck that option and test again.

                    Firewall: NetGate,Palo Alto-VM,Juniper SRX
                    Routing: Juniper, Arista, Cisco
                    Switching: Juniper, Arista, Cisco
                    Wireless: Unifi, Aruba IAP
                    JNCIP,CCNP Enterprise

                    M 1 Reply Last reply Reply Quote 0
                    • M
                      mrn @michmoor
                      last edited by

                      @michmoor Believe it or not, it STILL doesn't pull a DHCP lease.

                      I'm about to return this thing and try something else.

                      chpalmerC 2 Replies Last reply Reply Quote 0
                      • chpalmerC
                        chpalmer @mrn
                        last edited by

                        @mrn uncheck the two boxes for the reserved addresses on your WAN page.

                        Triggering snowflakes one by one..
                        Intel(R) Core(TM) i5-4590T CPU @ 2.00GHz on an M400 WG box.

                        1 Reply Last reply Reply Quote 0
                        • chpalmerC
                          chpalmer @mrn
                          last edited by

                          @mrn
                          This is how mine is set up.

                          WAN2.png

                          Triggering snowflakes one by one..
                          Intel(R) Core(TM) i5-4590T CPU @ 2.00GHz on an M400 WG box.

                          M 1 Reply Last reply Reply Quote 0
                          • M
                            mrn @chpalmer
                            last edited by mrn

                            @chpalmer

                            My modem is haunted. Which model do you use?

                            Screenshot from 2025-03-25 18-49-14.png

                            Screenshot from 2025-03-25 18-51-15.png

                            I rebooted the modem, I rebooted pfsense. It just does not work!!

                            M chpalmerC 3 Replies Last reply Reply Quote 0
                            • M
                              michmoor LAYER 8 Rebel Alliance @mrn
                              last edited by

                              @mrn
                              Desperation.
                              Try another port other than igb3

                              Firewall: NetGate,Palo Alto-VM,Juniper SRX
                              Routing: Juniper, Arista, Cisco
                              Switching: Juniper, Arista, Cisco
                              Wireless: Unifi, Aruba IAP
                              JNCIP,CCNP Enterprise

                              M 1 Reply Last reply Reply Quote 0
                              • chpalmerC
                                chpalmer @mrn
                                last edited by

                                @mrn said in Not getting DHCP lease from Netgear LB1120 LTE Modem Bridged:

                                @chpalmer

                                My modem is haunted. Which model do you use?

                                I also use the Netgear LB1120

                                Triggering snowflakes one by one..
                                Intel(R) Core(TM) i5-4590T CPU @ 2.00GHz on an M400 WG box.

                                1 Reply Last reply Reply Quote 0
                                • chpalmerC
                                  chpalmer @mrn
                                  last edited by

                                  @mrn Quit trying to spoof the MAC address.. Not sure why you would need it.

                                  Triggering snowflakes one by one..
                                  Intel(R) Core(TM) i5-4590T CPU @ 2.00GHz on an M400 WG box.

                                  1 Reply Last reply Reply Quote 0
                                  • M
                                    mrn @michmoor
                                    last edited by

                                    @michmoor

                                    A different port works!!!

                                    Thank you all!

                                    M 1 Reply Last reply Reply Quote 0
                                    • M
                                      michmoor LAYER 8 Rebel Alliance @mrn
                                      last edited by

                                      @mrn
                                      nice..
                                      dont know whats going on with igb3 in that case but glad its all sorted.

                                      Firewall: NetGate,Palo Alto-VM,Juniper SRX
                                      Routing: Juniper, Arista, Cisco
                                      Switching: Juniper, Arista, Cisco
                                      Wireless: Unifi, Aruba IAP
                                      JNCIP,CCNP Enterprise

                                      M 1 Reply Last reply Reply Quote 0
                                      • M
                                        mrn @michmoor
                                        last edited by

                                        @michmoor

                                        Yeah could be broken in many ways. I haven't used it for anything else. Thankfully I got another spare port.

                                        1 Reply Last reply Reply Quote 1
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