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    PfSense IAX trixbox

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    • D
      danswartz
      last edited by

      I think I need to be de-confused here.  I assumed your trixbox was behind a firewall using NAT (which is usually the case.)  If not, can you more clearly describe how the plumbing fits together?

      1 Reply Last reply Reply Quote 0
      • N
        northflux2
        last edited by

        Hi,

        Sorry didnt mean to confuse - no NAT at all on this network everything is routable static IP's.

        Say (example IP's):

        Gateway IP is    XX.155.38.193
        trixbox IP is:    XX.155.38.205

        pf Red    is:        XX.155.38.206  router is plugged into this
        pf Green is:        XX.155.38.207  lan is plugged into this

        then

        VOIP External Trunk provider knows to forward inbound calls to:  XX.155.38.205

        I can see the traffic leaving the ISP router to XX.155.38.205

        This is a dump from there router:

        19:33:17.244624 Tx length 65: [ses 0xb977] IP (0x0021), length 45: ThereIP.4569 > XX.155.38.205.4569: UDP, length 15

        I have a firewall rule specified to allow:

        PASS
        Proto:          UDP
        Source:        ALL
        Destination:  XX.155.38.205
        Port:            4569

        I thought this should mean that all traffic coming into XX.155.38.206 (red) would be allowed unmolested to XX.155.38.207 and onto the lan

        If I do a similar rule as above

        PASS
        Proto:          TCP
        Source:        ALL
        Destination:  XX.155.38.205
        Port:            22

        Then I have no problem at all getting a sh on the trixbox from outside the network.
        All other services on this network IMAP servers, Oracle servers, wiki etc….  non have a problem with this kind of config.

        If I turn off the pf System: Advanced:  Disable all packet filtering.  tick

        Then inbound calls also work fine.  This evidence coupled with the ISP router dump is what makes me believe its a pf problem.

        Hope this is clearer.

        Again thanks for your help.

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        • D
          danswartz
          last edited by

          okay, thanks.  does anything show up in the pfsense log when this is happening.  if you do a packet capture on the pfsense LAN, do you see anything?

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          • N
            northflux2
            last edited by

            Hi,

            No nothing in the logs.

            I've just done two capture runs whilst trying to dial in.  One on the wan and one the lan:

            WAN Packet capture

            18:44:38.362921 00:24:b2:3d:d8:f2 > 00:1a:92:29:2e:5a, ethertype ARP (0x0806), length 60: arp who-has XX.155.38.205 tell XX.155.38.193
            18:44:38.362953 00:17:3f:9b:dd:25 > 00:24:b2:3d:d8:f2, ethertype ARP (0x0806), length 42: arp reply XX.155.38.205 is-at 00:17:3f:9b:dd:25
            18:44:38.363038 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype ARP (0x0806), length 60: arp reply XX.155.38.205 is-at 00:1a:92:29:2e:5a

            LAN Packet capture

            18:45:53.097058 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57558, offset 0, flags [none], proto UDP (17), length 40) XX.155.38.205.4569 > externalVOIPProviderIP.4569: [udp sum ok] UDP, length 12
            18:45:54.099425 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57559, offset 0, flags [none], proto UDP (17), length 40) XX.155.38.205.4569 > externalVOIPProviderIP4569: [udp sum ok] UDP, length 12
            18:45:58.096821 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype ARP (0x0806), length 60: arp who-has XX.155.38.193 tell XX.155.38.205
            18:45:58.097115 00:24:b2:3d:d8:f2 > 00:1a:92:29:2e:5a, ethertype ARP (0x0806), length 60: arp reply XX.155.38.193 is-at 00:24:b2:3d:d8:f2
            18:46:04.926321 00:24:b2:3d:d8:f2 > 00:1a:92:29:2e:5a, ethertype ARP (0x0806), length 60: arp who-has XX.155.38.205 tell XX.155.38.193
            18:46:04.926415 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype ARP (0x0806), length 60: arp reply XX.155.38.205 is-at 00:1a:92:29:2e:5a

            Does that help?

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            • D
              danswartz
              last edited by

              Is this a transparent bridge setup?  I am seeing something weird.  They are ARP'ing for your trixbox, and two replies are being sent back, for two different MAC addresses.  ????

              1 Reply Last reply Reply Quote 0
              • N
                northflux2
                last edited by

                Hi,

                This is the trace when pf filtering is disabled and it works:

                WAN Packet capture

                18:54:13.801050 00:24:b2:3d:d8:f2 > 00:17:3f:9b:dd:25, ethertype IPv4 (0x0800), length 151: (tos 0x0, ttl 58, id 47889, offset 0, flags [none], proto UDP (17), length 137) externalVOIPProviderIP.4569 > XX.155.38.205.4569: [udp sum ok] UDP, length 109
                18:54:13.802783 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57608, offset 0, flags [none], proto UDP (17), length 46) XX.155.38.205.4569 > externalVOIPProviderIP.4569: [udp sum ok] UDP, length 18
                18:54:13.817037 00:24:b2:3d:d8:f2 > 00:17:3f:9b:dd:25, ethertype IPv4 (0x0800), length 60: (tos 0x0, ttl 58, id 47890, offset 0, flags [none], proto UDP (17), length 40) externalVOIPProviderIP.4569 > XX.155.38.205.4569: [udp sum ok] UDP, length 12
                18:54:14.025257 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57609, offset 0, flags [none], proto UDP (17), length 40) XX.155.38.205.4569 > externalVOIPProviderIP.4569: [udp sum ok] UDP, length 12
                18:54:14.039055 00:24:b2:3d:d8:f2 > 00:17:3f:9b:dd:25, ethertype IPv4 (0x0800), length 60: (tos 0x0, ttl 58, id 47891, offset 0, flags [none], proto UDP (17), length 40) externalVOIPProviderIP.4569 > XX.155.38.205.4569: [udp sum ok] UDP, length 12
                18:54:15.211999 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57610, offset 0, flags [none], proto UDP (17), length 40) XX.155.38.205.4569 > externalVOIPProviderIP.4569: [udp sum ok] UDP, length 12
                18:54:15.225562 00:24:b2:3d:d8:f2 > 00:17:3f:9b:dd:25, ethertype IPv4 (0x0800), length 60: (tos 0x0, ttl 58, id 47892, offset 0, flags [none], proto UDP (17), length 40) externalVOIPProviderIP.4569 > XX.155.38.205.4569: [udp sum ok] UDP, length 12

                LAN Packet capture

                18:54:53.213152 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57612, offset 0, flags [none], proto UDP (17), length 40) XX.155.38.205.4569 > externalVOIPProviderIP.4569: [udp sum ok] UDP, length 12
                18:54:53.229437 00:17:3f:9c:24:fc > 00:1a:92:29:2e:5a, ethertype IPv4 (0x0800), length 54: (tos 0x0, ttl 57, id 47894, offset 0, flags [none], proto UDP (17), length 40) externalVOIPProviderIP.4569 > XX.155.38.205.4569: [udp sum ok] UDP, length 12
                18:54:53.229626 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57613, offset 0, flags [none], proto UDP (17), length 40) XX.155.38.205.4569 > externalVOIPProviderIP.4569: [udp sum ok] UDP, length 12
                18:54:54.353898 00:17:3f:9c:24:fc > 00:1a:92:29:2e:5a, ethertype IPv4 (0x0800), length 151: (tos 0x0, ttl 57, id 47895, offset 0, flags [none], proto UDP (17), length 137) externalVOIPProviderIP.4569 > XX.155.38.205.4569: [udp sum ok] UDP, length 109
                18:54:54.355513 00:1a:92:29:2e:5a > 00:24:b2:3d:d8:f2, ethertype IPv4 (0x0800), length 60: (tos 0xb8, ttl 64, id 57614, offset 0, flags [none], proto UDP (17), length 46) XX.155.38.205.4569 > externalVOIPProviderIP.4569: [udp sum ok] UDP, length 18
                18:54:54.369374 00:17:3f:9c:24:fc > 00:1a:92:29:2e:5a, ethertype IPv4 (0x0800), length 54: (tos 0x0, ttl 57, id 47896, offset 0, flags [none], proto UDP (17), length 40) externalVOIPProviderIP.4569 > XX.155.38.205.4569: [udp sum ok] UDP, length 12

                How can i check the transparent bridge?   sorry if this is a stupid question!

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                • N
                  northflux2
                  last edited by

                  If you mean is the LAN interface bridged with the WAN then yes.

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                  • D
                    danswartz
                    last edited by

                    yes, that is what i meant.  can you post the mac addresses of the two pfsense nics as well as the trixbox nic?

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                    • N
                      northflux2
                      last edited by

                      trixbox:

                      eth0      Link encap:Ethernet  HWaddr 00:1A:92:29:2E:5A

                      pfsense:

                      re0: flags=8943 <up,broadcast,running,promisc,simplex,multicast>metric 0 mtu 1500
                      options=389b <rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,wol_ucast,wol_mcast,wol_magic>ether 00:17:3f:9b:dd:25

                      re1: flags=8943 <up,broadcast,running,promisc,simplex,multicast>metric 0 mtu 1500
                      options=389b <rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,wol_ucast,wol_mcast,wol_magic>ether 00:17:3f:9c:24:fc

                      bridge0: flags=8843 <up,broadcast,running,simplex,multicast>metric 0 mtu 1500
                      ether 0e:67:bb:99:2b:ab</up,broadcast,running,simplex,multicast></rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,wol_ucast,wol_mcast,wol_magic></up,broadcast,running,promisc,simplex,multicast></rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,wol_ucast,wol_mcast,wol_magic></up,broadcast,running,promisc,simplex,multicast>

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                      • D
                        danswartz
                        last edited by

                        this is weird.  it's like the pfsense is doing some kind of proxy arp.  what does your config look like?

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                        • N
                          northflux2
                          last edited by

                          I've just removed the NAT rule, which i mistakenly thought you wanted me to put in last night:

                          19:22:46.583484 arp who-has XX.155.38.205 tell XX.155.38.193
                          19:22:46.583855 arp reply XX.155.38.205 is-at 00:1a:92:29:2e:5a

                          Now its only replying with the one MAC much more sensible.

                          What do you mean "config look like"  firewall?

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                          • D
                            danswartz
                            last edited by

                            yeah, sorry, that was when i thought it was a NAT setup.  i assume it still does not work?  if so, it might be good to reboot the pfsense just to make sure everything is clean.

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                            • N
                              northflux2
                              last edited by

                              Hi,

                              Sorry had to go away for a few days.  I've rebooted the pf box and yes - unfortunately exactly still the same problem.

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                              • D
                                danswartz
                                last edited by

                                Can you take another packet trace?

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                                • N
                                  northflux2
                                  last edited by

                                  Thanks for all your help.

                                  Finally got it.

                                  In case this causes anyone else a problem:

                                  FW –> NAT --> Outbound --> Manual Outbound NAT rule generation

                                  And I should have.

                                  Deleted the existing default rule.

                                  Thanks again.

                                  1 Reply Last reply Reply Quote 0
                                  • K
                                    kartook
                                    last edited by

                                    ;D thanks i am here for the same kind a problem .Got a solution through this .

                                    Thanks Team
                                    K~

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