RT-AC5300 not passing DHCP traffic

[Cpbra617]

I recently bought an RT-AC5300 that seems to not be consistently passing DHCP traffic.
I have a separate DHCP server (Windows Server 2008 R2) on my home network.
I have multiple other access points on my home network as well.
When devices connect to the RT-AC5300 router, DHCP traffic has issues. Sometimes the devices get an IP address other times they do not.
If I connect to another AP on my network, I have no problems with DHCP. Only devices that connect to the RT-AC5300. If I replace the RT-AC5300 with the router that it replaced (Netgear) DHCP works fine.
This affects all devices.
Windows 10 laptops
Wink Hub
Android Phones
IOS Phones
etc...

 

[dosborne]

Are all your devices on the same subnet or are you using your router to route the broadcast messages?

 

[Cpbra617]

Are all your devices on the same subnet or are you using your router to route the broadcast messages?

Yes, single subnet. DHCP pass through works sporadically. When I reboot the router it works fairly consistently. After a few hours is when it starts to fail.
Wired devices are fine. Connecting wireless devices to other APs works fine. I would think that if the router were blocking the DHCP broadcast request, it would never work. Though I don't know where I can go on the router to check this. This is a bit confounding.

 

[ColinTaylor]

Are you on the latest firmware?

Does it only happen on certain WiFi bands (e.g 5GHz-1 and 5GHz-2, but not 2.4GHz)?

I seem to recall people occasionally reporting this sort of behaviour before, but I don't remember anyone posting a solution/explanation. I think you will have to run Wireshark/tcpdump on the client and server ends to see how far through the DORA process it gets and determine where the problem lies.

 

[Cpbra617]

Are you on the latest firmware?

Does it only happen on certain WiFi bands (e.g 5GHz-1 and 5GHz-2, but not 2.4GHz)?

I seem to recall people occasionally reporting this sort of behaviour before, but I don't remember anyone posting a solution/explanation. I think you will have to run Wireshark/tcpdump on the client and server ends to see how far through the DORA process it gets and determine where the problem lies.

I am on the latest firmware and it is happening on all 3 bands.
I was just kind of lazy and not interested in running netmon on my server to see what is going on .
Coincidentally, I migrated my DHCP server from a W2008 R2 to a Windows 2019 server yesterday and it looked good for a while. But this morning I noticed my wink hub was not getting an ip address. So back to square 1

Thanks.

 

[dosborne]

I am on the latest firmware

Can you specify which version just to be clear?

Someone reading this 6 months form now would have no clue if it applies to them or not (and, it may or may not be "latest" or important).

 

[Cpbra617]

Can you specify which version just to be clear?

Someone reading this 6 months form now would have no clue if it applies to them or not (and, it may or may not be "latest" or important).

Absolutely...
I am at 3.0.0.4.384_81219

 

[Cpbra617]

I wanted to add that if I reboot the router, the problem goes away for a few hours.