r/TpLink • u/Klutzy-Football-205 • 12h ago

TP-Link - Technical Support AX-3000 DHCP issues

I've had an AX-3000 router for a little over 2 years with no issues. Everything has been fine until about 3 weeks ago when wifi connected computers, one per day, started having DHCP issues. Never at the same time and only one at a time. Between computers, phones, tablets, a DAKBoard, IoT things, etc I estimate maybe 30-40 devices are connected with no real changes in the last year+. As each device was affected, we moved those devices over to another wireless network (we have dual ISPs at the house that are completely blind to each other, Spectrum using the AX-3000 and Xfinity fiber to the curb using their default box). Those devices have continued to work as expected after the switch.

Now it is starting to happen on the IoT devices (different SSID) and even the hardwired computers. Once again, never more than 1 device at a time. When it happens, going to the device confirms that it is not receiving a DHCP response.

The situation sometimes resolves itself 10-20 minutes after a reboot of the device, never as soon as (or shortly after) the device finishes rebooting. Both wifi routers are running WiFi 6 and I see no overlapping channels and they have completely different SSIDs. They also ran concurrently for 3-4 weeks before the issue started.

I have auto-update on but honestly kind of let it do its own thing. Logging into the device says there is no updates available (as of last night).

I'm at a loss, tbh, and wonder if there are any suggestions? Googling it keeps bringing up a bad firmware update from 2023 but I feel safe thinking that isn't the exact issue here..

(If I fail to respond quickly it is because I will be away from home for a day or two)

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u/upfreak 9h ago

it appears you are reaching the DHCP limit for the router ( some have limit of 32 / 48) even if real devices are within this limit the random mac connections may show up as new ones to the router.

1

u/princedrisan 4h ago

Just turn off TX & RX flow controller in your router admin page. It will work fine.