scottb66's profile

4 Messages

Sunday, February 25th, 2024 6:51 AM

Pace 5268AC modem does not see new Asus RT-AX88U Pro when connected to WAN, works with LAN port though

I have crappy AT&T 45MB internet, even though I live in Los Angeles and and the houses 100 feet behind me all have AT&T fiber but it's not on my street for some reason. I've had a Pace 5268AC for about 8 years in DMZ+ passthrough mode to an old ASUS RT-AC87R router the entire time. One of the antenna broke on the Asus so I decided to finally upgrade to the Asus RT-AX88U Pro. When I tried to set up the new router, immediately the router does not think anything is plugged into the WAN port when connected to the Pace 5268AC (the WAN light is red on the router and in the admin panel for the router it says "the network cable is unplugged") Also, the Pace 5268AC similarly does not see the Asus router (the "Ethernet" light on the modem is blank) I spent a few hours trying to diagnose this and eventually got the router/modem to see each other by enabling Dual WAN and connecting to the LAN 1 port on the Asus router. I assumed maybe the WAN port was dead on the router so I ordered another one. It showed up today and when I connected it to the Pace 5268AC and turned it on and before I even configured anything.... Same red light / no ethernet showing. So unless I got 2 routers with dead WAN ports I'm pretty sure there is some random config setting that isn't correct. Does anyone have any idea what may be wrong? I don't know if the issue is on the AT&T modem side or some setting in the Asus.

Things I have tried:

* Tried about a dozen different ethernet cables, including the ones that came with either router. It is not a bad cable.

* Readded the new modem to the Passthrough/DMZ+ setting of the Pace 5268AC. All wifi is disabled on the Pace 5268AC and the firewall settings are disabled.

* The Pace 5268AC and Asus RT-AX88U Pro are on different subnets (192.168.1.* and 192.168.2.* respectively)

* Updated the firmware of the Asus. The port neither works on stock firmware, nor the latest, and I even tried the previous update as well.

* Googled for hours but only finding issues where people's WAN ports worked at first and then were destroyed by power surges or other random things

The only thing I haven't done yet is contact Asus support which I was dreading since I can see them just blaming the AT&T modem (and vise versa). But that will be my next step. I can't wait till they try to RMA the modem and send me a third which will likely not work either.

I'm confused because it works with the WAN port on the older Asus. The only difference really with this new router is the WAN port is a 2.5Gb/s port. Would that somehow matter? There is a specific 2.5Gb/s LAN port on this router as well that is working as I have that connected from the router to a Cisco unmanaged switch and everything downstream of that is working / has internet. It is odd how neither modem recognizes the other, like they're not speaking the same language on that one port. 

Once again, note I do have the router / internet working via the LAN 1 port on the Asus connected to any of the LAN ports on the 5268AC, but I want to fix the WAN port. Not that my pathetic 45Mb needs it, but in the future if they ever figure out how to give me the Fiber that I can see on the poles behind my house.

Accepted Solution

4 Messages

2 months ago

So after more research it appears that the Pace 5268AC does not know how to deal with 2.5Gb ports. I stuck an unmanaged TP-Link switch between the Pace 5268AC and the Asus RT-AX88U Pro and the WAN port works now. Whenever I get a chance to call into AT&T I guess I'll ask for an updated modem? Are they still giving out Pace 5268ACs? This is the only modem they've ever given me. 

Community Support

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231.2K Messages

2 months ago

Hi @scottb66,

 

We understand that you’re experiencing connectivity issues between your Pace 5268AC modem and your new Asus RT-AX88U Pro router. Let’s troubleshoot this together and explore potential solutions.

 

Firstly, check whether you have updated the router's firmware to the latest version. Access the Pace 5268AC modem’s interface by opening a web browser and navigating to ⁠http://192.168.42.1 (or http://192.168.1.254 for older versions). In the modem settings check for below settings:

  • Turn off Wi-Fi on the Pace 5268AC.
  • Navigate to Firewall > Applications, Pinholes, and DMZ.
  • Add the Asus router’s MAC address to the DMZ+ setting.
  • Uncheck any advanced settings that might interfere.
  • Save the settings and reboot the modem.

You mentioned that enabling Dual WAN mode allowed the router and modem to see each other. However, the internet connection was unstable afterward. Try disabling Dual WAN mode and connect the router directly to the modem’s WAN port.

 

We also recommend our article on setting up 3rd party devices.

 

Please let us know if this is helpful to you. We are happy to provide further assistance.

 

Thank you for reaching out to us on  AT&T Community Forums. 

 

Jennifer, AT&T Community Specialist.

4 Messages

2 months ago

As mentioned, I had already added the Asus RT-AX88U Pro to the DMZ+ mode. The internet works fine on the LAN 1 port, it is not unstable and I'm not sure where you got that idea. Maybe because I mentioned the speed was only 45Mb but that's just the rate plan AT&T offers for my address. That speed is as intended. So everything works fine on Dual WAN when the router is using the LAN 1 port, the problem is the internet doesn't work on the WAN port which is what I'd like to fix. To clarify:

When plugged into the WAN port on the Asus RT-AX88U into _any_ LAN port on the Pace 5268AC (I've tried all 4) the internet does not work. In the Asus control panel it simply says "The network cable is unplugged" and the red light for the WAN port on top of the modem is lit indicating a problem. On the Pace 5268AC the "Ethernet" light does not light up either. As previously mentioned, I've tried multiple ethernet cables and I got a replacement Asus RT-AX88U Pro modem so I'm confident it is not a faulty cable and 99% confident it's not a broken WAN port on the Asus (unless we think I got 2 bad brand new modems)

The steps listed in the "Setting Up 3rd party devices" article is exactly what I've done.

Something that may be noteworthy, in the LAN > STATUS section of the admin panel of the Pace 5268AC it shows that packets are ever so slowly being sent and received over Ethernet 1 which is the port I have the Asus WAN port plugged into when connecting via Dual WAN, so some type of communication is happening. Ethernet 1 is connected to the WAN port of the Asus and Ethernet 2 is connected to LAN 1 on the Asus. This value is very slowly rising when I reset the page. Here is a screenshot:

Community Support

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231.2K Messages

2 months ago

Thanks for writing back to us.

We understand how important having your service up and running in WAN port is. Let's guide you in the right direction.

After reviewing your concern and trying to resolve through the Community Forums, it looks like you may need more account specific support. To assist you best, we encourage you to review our Contact Us page to identify what method you’d prefer to reach out for this account level help. You can call, chat, or reach out via social media, and we can review your specific issue and provide you support. We’re sorry we weren’t able to resolve your concern directly in the forums, but let us know if we can assist with anything else.

Thank you.
David, AT&T Community Specialist.

ACE - Professor

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5.4K Messages

2 months ago

@scottb66 

Are you doing something particular to require having your personal router in DMZ mode?   Could you manage your home network as an access point?

4 Messages

2 months ago

@gr8sho I'm more familiar with the Asus admin panel as I've been using it for over a decade. This new router allows me to set up multiple VLANs not just the single guest network that the Pace allows me.

But what does that have to do with whether or not the WAN port works or not? Setting the router to DMZ+ mode or not does not change anything in terms of the WAN port working as that's how I originally had everything configured when I initially was setting up the new Asus router.

ACE - Expert

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34.9K Messages

2 months ago

No, they are not giving out 5268AC any more because are no longer providing firmware upgrades for it.  Unless you need the COAX connector on yours, let AT&T replace it with a BGW210 or BGW320.  The ports are still 1Gb, but maybe they'll deal with the 2.5 Gb one better.  Of you could just keep a switch in line.

(edited)

ACE - Professor

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5.4K Messages

2 months ago

As @JefferMC points out, getting a supported gateway wouldn't be the worse thing here.  The BGW210 uses IP passthrough as a construct instead of DMZ+, conceptually the same though. 

Anyway, I'd factory reset the gateway and try setting the personal router again with DMZ+. After the setup on the gateway side, reboot your router and it should pickup the WAN connection.  At least that's how it's supposed to work.

ACE - Expert

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34.9K Messages

2 months ago

@gr8sho , OP seems to have diagnosed this as a physical layer Ethernet problem, i.e. the WAN port of his router supports 2.5 Gb, and inserting an Ethernet switch inline corrects the issue he is seeing.  Looks like the Ethernet chipset/Firmware in the 5268AC can't negotiate with the Chipset/firmware in the router to arrive at a 1 Gb connection.  The Switch can.

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