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    ISP giving my firewall Special Use IP

    Scheduled Pinned Locked Moved DHCP and DNS
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    • B
      bhjitsense
      last edited by

      We recently had severe weather which caused internet to be out for several weeks. It's now back up. But I see my router's WAN interface is getting an address in the IANA Special Use range of 100.64.0.0/10. But If I plug my laptop directly into their drop, I get the usual publicly routed address. This is causing my Dynamc DNS to be incorrect, as WhatsMyIP shows the usual public address and not the Special Use address. My ISP doesn't see to have a clue why that's a problem or why only my router is getting that address. Which brings me here. Is there anything I can do on my end?

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

        @bhjitsense

        What's your DHCP lease time from your ISP? It could be your firewall is still being assigned that address, while the computer, with a different MAC, gets a different address. Try the dhclient -r command. Then try for a new address.

        Here's some info on it:

        The client normally doesn't release the current lease as it is not re-
        quired by the DHCP protocol. Some cable ISPs require their clients to
        notify the server if they wish to release an assigned IP address. The
        -r flag explicitly releases the current lease, and once the lease has
        been released, the client exits.

        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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