Can only use static IP with RT-AC88U and Windows DHCP server

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Vertigo 7
DD-WRT Novice


Joined: 02 Jan 2021
Posts: 16

PostPosted: Sat Jan 02, 2021 20:58    Post subject: Can only use static IP with RT-AC88U and Windows DHCP server Reply with quote
Hoping someone can help me figure out what's going on here.

So until today I had been using the ASUS firmware on my router (RT-AC88U).

Currently I have build 45229 running on the router.

I have a machine running Server 2016 with IPv4 DHCP. I have DHCP set to disabled in the DD-WRT basic setup and all checkboxes unchecked.

I cannot get IP assignments either through wired or wireless. Setting a static address seems to be the only thing that's working and I can ping the DHCP server (which was already static, obviously).

If I enable the DHCP server on the router, I get IPs.

I'm guessing at this but it seems like something in the router is blocking DHCP requests or acknowledgements from the server.

I've not setup any vlans. Other than setting the Router's IP and subnet as well as the WiFi SSIDs and encryption, everything is defaulted.

Anyone have any clue what the deal could be? If you need more info, lemme know.
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Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6033
Location: Romerike, Norway

PostPosted: Sat Jan 02, 2021 21:10    Post subject: Reply with quote
Have you enabled Net Isolation?
Vertigo 7
DD-WRT Novice


Joined: 02 Jan 2021
Posts: 16

PostPosted: Sat Jan 02, 2021 21:21    Post subject: Reply with quote
I have not, no. All wired and wireless devices are no longer able to pull DHCP assigned addys.
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6033
Location: Romerike, Norway

PostPosted: Sat Jan 02, 2021 21:38    Post subject: Reply with quote
Are both the server and the client on the same switch?

This router have a RTL8365MB with 4 ports.
The other 4 ports are in the Broadcom SOC.
Vertigo 7
DD-WRT Novice


Joined: 02 Jan 2021
Posts: 16

PostPosted: Sat Jan 02, 2021 21:40    Post subject: Reply with quote
Yes, I actually have 2 unmanaged switches connected to ports 1 and 2 on the router. All of the wired devices, including the dhcp server, are on those 2 switches. The other 6 ports are unused.

Edit*

I can ping the server and RDP into it. DNS on the server is functional as well.
Vertigo 7
DD-WRT Novice


Joined: 02 Jan 2021
Posts: 16

PostPosted: Sun Jan 03, 2021 2:14    Post subject: Reply with quote
Sadly, I ended up reverting back to the Asus firmware. After doing some more poking around I found I actually could not get any wired device to talk to anything on the network, but oddly I could talk to the wired devices from wireless devices.

I have no idea what the deal there was but I gotta have my network functional for muh job.
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 6033
Location: Romerike, Norway

PostPosted: Sun Jan 03, 2021 11:10    Post subject: Reply with quote
Have you tried to move to port 7 and 8 to see if it make any difference?

Is swconfig available to configure the RTL switch?

swconfig list
Vertigo 7
DD-WRT Novice


Joined: 02 Jan 2021
Posts: 16

PostPosted: Sun Jan 03, 2021 13:04    Post subject: Reply with quote
Yeah, I tried moving to ports 7 and 8, no change.

I'm willing to try again at a later date, I'm back up and running on the Asus firmware now. I'd be interested to know what builds folks have gotten to run with this particular router.
naruto_uzumaki
DD-WRT Novice


Joined: 17 Oct 2020
Posts: 1

PostPosted: Mon Jan 04, 2021 5:22    Post subject: Reply with quote
I have no issue running 45229 on AC88U.

Router Name AC88U
Router Model Asus RT-AC88U
Firmware Version DD-WRT v3.0-r45229 std (01/01/21)
Kernel Version Linux 4.4.248 #1698 SMP Fri Jan 1 11:09:05 +07 2021 armv7l
Vertigo 7
DD-WRT Novice


Joined: 02 Jan 2021
Posts: 16

PostPosted: Mon Jan 04, 2021 5:52    Post subject: Reply with quote
naruto_uzumaki wrote:
I have no issue running 45229 on AC88U.

Router Name AC88U
Router Model Asus RT-AC88U
Firmware Version DD-WRT v3.0-r45229 std (01/01/21)
Kernel Version Linux 4.4.248 #1698 SMP Fri Jan 1 11:09:05 +07 2021 armv7l


Interesting. Did you have to make any changes to the default config for basic network functions over the wired side?

Also, did you use the default 192.186.1.x subnet?
Vertigo 7
DD-WRT Novice


Joined: 02 Jan 2021
Posts: 16

PostPosted: Tue Jan 05, 2021 1:20    Post subject: Reply with quote
Well, I tried again and it seems to be working, for the most part. I must have done something wrong, some how, during the flashing process. But whatever, it's up minus a couple of wireless cameras not connecting for some reason.
BradGouldy
DD-WRT Novice


Joined: 11 Jan 2021
Posts: 2

PostPosted: Mon Jan 11, 2021 12:22    Post subject: Reply with quote
Vertigo 7 wrote:
Well, I tried again and it seems to be working, for the most part. I must have done something wrong, some how, during the flashing process. But whatever, it's up minus a couple of wireless cameras not connecting for some reason.


How did you get this to work? IM having the same issue? I can only get DHCP to work on wireless?
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