AC5300 2.4Ghz WiFi not forwarding DHCP

[Rainman]

Hi Guys,

Just bought an RT-AC5300 and very happy with the performance thus far but I've hit a bit of a problem. I did have a search and I discovered there were some issues at a particular firmware level that stopped clients on 2.4Ghz having their DHCP requests forwarded. If I configure a static address then it works perfectly.

I'm using the DHCP services of a Windows 2012 Server on my network and it works fine for all client wired and wireless on my network, except anything from the new router connected via 2.4Ghz. Clients connecting via 5Ghz work fine and obviously all wired clients work fine too. If I use DHCP on the router it appears to work but that's no good to me.

I'm running the latest firmware rev 3.0.0.4.380_4180 which was released recently. I did find some info about some changes related to "switch control" where enabling/disabling and doing a hardware reset appeared to solve the issue but danged if I can find the info now I need to refer to it - I've spent ages searching and I'm sure I originally found it on here somewhere.

Does anyone know if this latest firmware solves this bug and if so can they direct me to the page which had the resolution on it. I've already tried changing what I thought was required and done a hardware reset and reconfigured but it seems to have made no difference, so some clarification would really be appreciated. Do I need to revert to an earlier firmware? This really does seem like a glaring bug and if I can't resolve it then I'm going to back it to Amazon, which is a shame because the performance is excellent if I configure static addresses. I could configure a split-scope for DHCP between my server and the router I'd rather not.

Many thanks for you help.

 

[Rainman]

Update

I had another rummage around the ASUS forums and found some posts related to a work around that asus appear to have provided.

Under Wireless-Professional there is a setting called "Airtime fairness". Disable this and I can now appear to get DHCP address leases via 2.4ghz wifi. I'll track performance and let you know how it goes.

Hope someone else finds this useful.

 

[Rainman]

Just bumping this as I still see a lot of people posting with this issue. Airtime Fairness has fixed this. It's been working perfectly for nearly 2 months now.

 

[Alitai]

Thanks.

Have the same Problem on my AC88U...

I will loook now.

Have a nice Day.

Best Regards

Alitai

 

[frechp]

Thank you soooo much @Rainman! Was stuck on an old firmware for a while because of this. Even Merlin had issues. Can confirm that Merlin 380.68_2 was not working, but can now get DHCP leasing with Airtime Fairness Off on 2.4Ghz. Thanks again!