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DHCP Lease Times for Static IP Addresses

Don Fisher1

Hello Everyone.

I have recently reworked my entire network and as I have worked out the last few bugs, I have run into something that I am not able to figure out.  I generally assign static IP addresses to everything that is 'permanent' to my network.  Maybe unnecessary, but I have an OCD thing and I have to be able to recognize everything on my network easily and know where it is (by address).

In my old setup with UTM9, I never had any issues but now I am running XG and my network hardware is different.  The issue I am having is with my IoT segment.  I have a bunch of smart light switches that I have put on their own VLAN for performance and security reasons and once the DHCP lease is up, the devices will disconnect from the network and are not able to reconnect on their own.  If I power cycle them, they do not have any trouble connecting.

Previously, I had a Netgear router in AP mode handling this traffic and with the UTM 9 it never had an issue.  I have replaced the Netgear router with a couple of Netgear business AP's in a mesh and of course replaced the UTM 9 with XG.

For testing purposes, I set the DHCP lease to expire every 10 minutes and then I power cycle every device.  I can see the XG provide a new lease to each device as soon as it reconnects to the network, and once the lease expires, I can see a new lease but the device is disconnected.  When I go to the logs in the AP's, I can see the device disconnect and the next message indicates that the client is unable to obtain an IP address.  It shows as connected to the AP, but no network.

I guess my question is - can I set the lease for static addresses to never expire?  If not, does anyone have any idea what would prevent the device from reconnecting when the lease expires?  I have made every configuration change possible on the AP's like turning on/off all the different radio frequencies, changing channels, changing the authentication method (WPA2, WPA3, etc) and have had no luck.

Any advice is greatly appreciated.  I can add all the network particulars and firewall setup if y'all think it would help.

TIA,

Don F.



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  • 0

    Don,

    I have the same issue with my NEW Netgear WAX206. I also have them set up in AP mode and I also have an issue with renewing my leases. My logs show the same issue with ports 67 and 68.

    I was using an Asus Router with Merlin Firmware as an access point and recently changed to the Netgear. With the Asus, I had no issues. I think it has something to do with the Netgear firmware, but I have no idea how to pinpoint it.

    I also had some AP 740x and AP 100C and never had issues with them.  

    I am NOT using VLANs

  • 0 in reply to Chad Delatte

    It isn't good to hear that you are experiencing the same thing, but I'm glad that I'm not alone.  I have 2 WAX620s that do this and a WAC510 that does not.  I moved everything to an old nighthawk r8000 and it also does not have this issue.  Netgear support assures me that they are working on it, but i'll believe it when i  see it.  Do you have a support ticket open with them?

    In the meantime, it would be great to figure out a way to not have the leases renew.  I'm no network expert, but it seems silly to me that a static address needs to renew its lease.

    I'm still fiddling with the XG to see if there is a way around that, but I am not confident.  Let me know if you come up with anything and I'll do the same.

  • 0 in reply to Don Fisher1

    If you set the devices to an IP address outside the DHCP range then set them a static addressing then you don't need to worry about the DHCP timing.

    Ian

    XG115W - v19.5.1 mr-1 - Home

    If a post solves your question please use the 'Verify Answer' button.

  • 0 in reply to rfcat_vk

    That's exactly what I have done and the lease still expires. DHCP starts at 100 and all these devices are in the 20 - 50 range with static addresses.

    I thought that the lease was permanent when it was static, but it appears to expire.  Is there some setting that I am missing that is causing it to expire?

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  • 0 in reply to rfcat_vk

    That's exactly what I have done and the lease still expires. DHCP starts at 100 and all these devices are in the 20 - 50 range with static addresses.

    I thought that the lease was permanent when it was static, but it appears to expire.  Is there some setting that I am missing that is causing it to expire?

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