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    Strange address Shown in the dhcp leases

    Scheduled Pinned Locked Moved General pfSense Questions
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    • H Offline
      hda
      last edited by

      Access Control List(s)

      In pfSense have look at Services: DHCP server [MAC Address Control]

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      • F Offline
        firefox
        last edited by

        @johnpoz:

        Why don't you look in the actual file for what it shows for the end date, and see what we have..

        example
        [2.2.2-RELEASE][root@pfSense.local.lan]/var/dhcpd/var/db: cat dhcpd.leases

        lease 192.168.2.216 {
          starts 6 2015/06/13 12:04:00;
          ends 3 2015/06/17 12:04:00;
          cltt 6 2015/06/13 12:04:00;
          binding state active;
          next binding state free;
          rewind binding state free;
          hardware ethernet ac:fd:ec:62:34:97;
          uid "\001\254\375\354b4\227";
          client-hostname "Johns-Phone";

        cltt stands for Client Last Transaction Time, not sure why its showing that vs the end date?  I would also track down what device it is, that is clearly an ODD mac..

        Where the last line ```
        client-hostname "Johns-Phone";

        
        It is not registered anything in the output of the command (in my computer)
        
        and now it is cltt 6
        
        

        lease 192.168.0.43 {
          starts 6 2015/06/13 21:31:09;
          ends never;
          cltt 6 2015/06/13 21:31:09;
          binding state active;
          next binding state free;
          rewind binding state free;
          hardware ethernet 00🆎00:00:00:00;

        
        How exactly do I use with this ACL option
        
        I have to enroll all Mac addresses of all computers on the network
        One by one comma separated
        
        it says partial MAC addresses
        Which part ?
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        • M Offline
          motionthings
          last edited by

          edit3
          My post was about wireless security, and did not belong here.
          I'll not be offended if it gets deleted. http://pastebin.com/QaGHXbU4
          /edit 3

          edit2
          Looks like @cmb has a really good answer. Thanks :-)
          /edit2

          Intel Core i3, 8GB RAM, 2x Intel Gigabit NIC's.
          CURRENT network: https://cacoo.com/diagrams/1Fh6EcMdZLjGq3zj
          Planned network: https://cacoo.com/diagrams/y2rMw37kzlzcHzZy
          Read BOFH (Bastard Operator From Hell): http://bofh.ntk.net/BOFH/index.php

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          • H Offline
            hda
            last edited by

            @firefox:

            …
            it says partial MAC addresses
            Which part ?

            http://www.gcstech.net/macvendor/index.php?node=macsea

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            • C Offline
              cmb
              last edited by

              That's a BOOTP lease, which is why it looks weird.

              Hostnames are only there where the client sends one. It not having one isn't unusual, especially for the types of devices that do BOOTP.

              There are very limited devices that use BOOTP. Generally they're very old (1990s era printers for instance), or atypical embedded devices. It could be some broken device as well.

              It seems to be a semi-active device, or at least your time of last contact (cltt) seems to update. If you have a managed switch, try tracking down that MAC address' port and see what's plugged into it. If you don't have a managed switch it'll be harder to track down, though not too difficult if you have a small network. Unplug most things, see if it's still updating. Add things back one by one. See when that comes back. Or just try reaching the device to see what it's running. A nmap scan with OS identification enabled might be telling.

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              • C Offline
                cmb
                last edited by

                @Jailer:

                checking now but even if it is why would it be set to never expire?

                BOOTP leases never expire.

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                • C Offline
                  cmb
                  last edited by

                  That MAC seems to be something a number of other people have seen pulling BOOTP leases, though at a glance through Google results I don't see anyone who found the source of it. Might be worthwhile to dig through those results more closely.
                  https://www.google.com/webhp?q=%2200🆎00:00:00:00%22

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                  • F Offline
                    firefox
                    last edited by

                    I know
                    Already encountered this once
                    Last time i  simply blocked the address

                    This time I wanted to know where it came from

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                    • johnpozJ Offline
                      johnpoz LAYER 8 Global Moderator
                      last edited by

                      well track it down – its clearly on your 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 25.07 | Lab VMs 2.8, 25.07

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                      • F Offline
                        firefox
                        last edited by

                        I've checked
                        No device in my network
                        Have such address

                        That's why I ask

                        I blocked it again
                        As before

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                        • JailerJ Offline
                          Jailer
                          last edited by

                          Yeah it's definitely not a device on my network, this is my home network and every device is accounted for.

                          Could it possibly be my Dlink router that I'm using as an AP? DHCP is turned off on the router but the wireless does occasionally quit working, especially when it gets warmer out, requiring a power cycle to restore it.

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                          • johnpozJ Offline
                            johnpoz LAYER 8 Global Moderator
                            last edited by

                            Sorry but its has to be something on your network..

                            Could be something like a media player, dvr, doubt its your dlink.. But sure..  When you delete the lease how long until it comes back?  Is it every 24 hours, every 1 hour, every 10 minutes?  Does it ping to that IP you gave it?

                            What interface are you seeing it on?  Lan, Wan, Wireless?  You don't have a smart switch that shows you mac address table?

                            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 25.07 | Lab VMs 2.8, 25.07

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                            • JailerJ Offline
                              Jailer
                              last edited by

                              Shows up on LAN, no smart switch. I'll have to check when I get home to see if it's back again. Had a power outage yesterday and as of last night it wasn't there.

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                              • johnpozJ Offline
                                johnpoz LAYER 8 Global Moderator
                                last edited by

                                Is your lan bridged to your wireless?  If showing up on your lan - clearly its on your 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 25.07 | Lab VMs 2.8, 25.07

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                                • JailerJ Offline
                                  Jailer
                                  last edited by

                                  No bridge, just DHCP disabled and static IP so it's working as an AP. pfsense is handling all the routing.

                                  Checked my leases and it's not there any more. I dunno, maybe something left over from one of the many VM's I've had running? I'm out of ideas.

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                                  • johnpozJ Offline
                                    johnpoz LAYER 8 Global Moderator
                                    last edited by

                                    So your wireless is on the same network as your lan - ie bridged..

                                    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 25.07 | Lab VMs 2.8, 25.07

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                                    • JailerJ Offline
                                      Jailer
                                      last edited by

                                      If that's what "bridged" means then yes. It is on the same subnet as LAN.

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                                      • F Offline
                                        firefox
                                        last edited by

                                        @johnpoz:

                                        Sorry but its has to be something on your network..

                                        Could be something like a media player, dvr, doubt its your dlink.. But sure..  When you delete the lease how long until it comes back?  Is it every 24 hours, every 1 hour, every 10 minutes?  Does it ping to that IP you gave it?

                                        What interface are you seeing it on?  Lan, Wan, Wireless?  You don't have a smart switch that shows you mac address table?

                                        Here is a list of all the addresses on my network
                                        1-27 are static addresses

                                        and 43 is Dynamic address

                                        If I shut down the DHCP
                                        I assume he could not get access to the network
                                        but Guests also can not

                                        If I delete this address
                                        After a while, it comes back
                                        Can be after 10 minutes
                                        Can be after two hours
                                        Can be after 16 hours
                                        No fixed time

                                        You can not ping to it

                                        PING 192.168.0.43 (192.168.0.43) 56(84) bytes of data.
                                        From 192.168.0.2 icmp_seq=1 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=2 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=3 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=4 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=5 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=6 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=7 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=8 Destination Host Unreachable
                                        From 192.168.0.2 icmp_seq=9 Destination Host Unreachable
                                        
                                        

                                        I do not have a smart switch
                                        i see this address on my LAN
                                        i have WAN ,LAN, WIFI, and BRIDGE (lan and wifi)

                                        I have 2 routers that serve as an access point
                                        edimax 192.168.0.104
                                        dlink 192.168.0.101
                                        a network card on the pfsense also as AP (the wifi)
                                        and one cisco access point (192.168.0.25)
                                        all have fixed (static) IP
                                        DHCP shut down in the routers

                                        I went physically at home  to each device that connects to the network
                                        And checked Mack addresses the same as in the DHCP leases

                                        ![mac address.png](/public/imported_attachments/1/mac address.png)
                                        ![mac address.png_thumb](/public/imported_attachments/1/mac address.png_thumb)

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                                        • T Offline
                                          tim.mcmanus
                                          last edited by

                                          If you have a *NIX box on your network you can run nmap to do some network discovery and determine what is where.  I think there's also an nmap package for pfSense that would also scan your network and determine what is running where.  Very handy and powerful utility.

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                                          • F Offline
                                            firefox
                                            last edited by

                                            what is "NIX box" ??

                                            Know the package which is installed
                                            It does not show anything

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