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    Are 120 second DHCP leases on the WAN ok?

    DHCP and DNS
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    • R
      ryan29 last edited by

      Hi,

      When looking at a firewall recently I noticed the WAN gateway issuing 120 second DHCP leases.  That means pfSense renews the lease every 60 seconds.  Is the renewal 100% seamless if the same IP is assigned?  I'm trying to figure out if it's something I should spend more time on or if it's ok to ignore.

      TIA,
      Ryan

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      • Derelict
        Derelict LAYER 8 Netgate last edited by

        Not a lot you can do about it if that is what your stupid ISP is doing.

        Chattanooga, Tennessee, USA
        The pfSense Book is free of charge!
        DO NOT set a source 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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        • K
          kpa last edited by

          Nope, the DCHP server is the king in this situation and you won't be able to use an expiring lease any longer than the server allows you to.

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          • JKnott
            JKnott last edited by

            120 second lease?  That's going to generate a lot of traffic on the WAN side as all customers will be renewing every minute.  IIRC, the lease time from my ISP is 7 days, though it's been years since I checked.  Hours or days are typical for DHCP leases.

            PfSense running on Qotom mini PC
            i5 CPU, 4 GB memory, 64 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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            • R
              ryan29 last edited by

              @JKnott:

              120 second lease?  That's going to generate a lot of traffic on the WAN side as all customers will be renewing every minute.

              The IPs are from an on-site, ISP controlled device using the 100.64.0.0/10 space.  The pfSense WAN is the only thing pulling an IP from it.  Other customers would have their own device.

              I was mainly wondering if it's something worth pursuing with the ISP since it's unlikely they'll do anything about it.  It would take a lot of effort, so, if there aren't any significant drawbacks on the pfSense side, I'll probably end up ignoring it.

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              • Derelict
                Derelict LAYER 8 Netgate last edited by

                If you don't "feel" it, there's not really anything to do.

                Chattanooga, Tennessee, USA
                The pfSense Book is free of charge!
                DO NOT set a source 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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