Business Community > Routers > Solution to DHCP Issues of Routers (ER605 | ER7206 | ER8411 | ER7212PC) [Closed on May 22nd 2023]
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Solution Solution to DHCP Issues of Routers (ER605 | ER7206 | ER8411 | ER7212PC) [Closed on May 22nd 2023]

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Solution Solution to DHCP Issues of Routers (ER605 | ER7206 | ER8411 | ER7212PC) [Closed on May 22nd 2023]

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276 Reply
Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11th 2022]
2022-12-27 20:26:43

  @DannyZ unfortunately completely agree. My work around is to use the last year version of controller and router and it seems more or less stable (bar minor bug allegedly fixed in version 5). But I just have no confidence in upgrading when such a fundamental issue is not fixed. It seems that there is either the fundamental lack of testing or the issue appears due to memory leak or corruption of some sorts. I think everyone agrees that the hardware is good it is just a shame about software.

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#127
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11th 2022]
2022-12-27 23:28:16

  @Hendrics

See post #74 & 84.

I walked back the firmware to

R605(UN)_V1_1.1.1_Build 20210723

And the problem persists. Obviously 1,000's of other users don't have the problem so I now believe it is a hardware issue the firmware is never going to fix.

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#128
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11th 2022]
2022-12-29 16:26:20

  @KellisR 

I have ER7206 and i went back to 1.1.1 Build 20210723 Rel.64359 and it started to perfroming fine after going back. I was on 1.2.1 for 3 days only and spotted several devices getting same ips after that time. 

I am still on omada controller 4.4.6 though, so not sure if that plays a part. I have about 60 clients (mostly wifi), 3 eaps and hardward controller oc200. 

I have some IPs reserved. 

You are right, it is strange that myabe not as many people complain. But i also have been having the same setup for the year and it has never seen that issue before. 
Make sure you reboot all things after upgrading back. 

My Lease Time: is 120 mins. Which is fairly small 

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#129
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11th 2022]
2023-01-04 19:29:09

I have also many Problems getting IP Adresses from ER7206 @ v1_1.2.3.

It is frustrating.

The following will help for a moment... I "Click Force Provision" to the ER7206 in OC200 controller.

But this helps only for a while.

Where can I get the firmware 1.1.1 ? At TP-Link Homepage it's not available.

 

 

 

 

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#130
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11th 2022]
2023-01-04 20:12:56

  @User04012023 

I just double checked and indeed it disappeared from the website :(. I am very surprised it was removed. 

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#131
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11th 2022]
2023-01-04 20:22:39
You can find the 1.1.1-firmware on the international sites for TP-Link, like for example the Norwegian site: https://www.tp-link.com/no/support/download/tl-er7206/#Firmware The firmware versions are UN as in universal and will therefore work on ER7206 bought all over the world.
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#132
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11th 2022]
2023-01-04 23:06:16

Downgrade to Firmware ER7206 @ v1_1.1.1 worked for me.
Now the DHCP issues no longer annoying.

 

The red arrow at screenshot shows CPU/Memory after downgrade.

 

 

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#133
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11st 2022]
2023-01-06 02:56:36 - last edited 2023-01-06 03:09:59

@Fae any updates on this issue? It's been nearly two months now, and still no beta firmware, or anything at all from the engineers on what may be going wrong here? I have 10 gig fiber coming in a few weeks, I was going to purchase some new Omada 10g switches, but after this mess, that is definitely NOT happening, at least not until the router has the basic functionality it's advertised with.

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#134
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11st 2022]
2023-01-06 03:16:01

  @havenstance 

 

Don't do it. I've invested thousands of dollars in TP-Link equipment and the support is non existent, the firmware updates have no documentation, firmware often is untested and full of bugs at rollout, and there is few useful features that actually work. Look at how many people have contributed to this post about problems and count how many were resolved. 

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#135
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Re: ER605 ER7206 v1 - DHCP Server May Fail With 1.2.0 and 1.2.1 Firmware [Updated on Nov 11st 2022]
2023-01-06 03:28:08

  @DannyZ FWIW Spent a week going back and forth with TP-Link official support. Here is my last reply to them and their final reply to me.

 

End result is the router is gong back to Amazon and I have purchased a dd-wrt install from flashrouters.com to a Netgear AC1450 because it's old enough to be stable.  

 

----------------------------------------------------------

 

I have already tired every single thing you suggest, including trying to ping 8.8.8.8 when the device says it can't connect to a DNS server.
 
We recommend that you try resetting this router to see if the problem is solved. 
 
-  I have done this a minimum of 10 times. It doesn't solve the problem. Why would doing the same thing over and over have a different result?
 
And please make sure the firmware of this router is the latest. You can check it on our official website:  Download for ER605 | TP-Link
 
- I told you I loaded the previous firmware because the most recent firmware had the same problem indicating it is not a firmware problem. The firmware you are suggesting I load had the same problem.
 
When the issue happen, please use  ipconfig command  to check the IP address of your device. And provide us the screenshot of the result.
 
- This evening my Lenovo Yoga stopped connecting to the internet. The IP address was 192.168.0.129. See attached screen shot. I had to reboot the Yoga to get an ip address so I could get the screen shot off it.
 
-  See attached screen shot of the TP-Link DHCP client list. It shows the 192.168.9.129 issued to the Yoga that wasn't working and the 192.168.0.111 issued to the Dell I am using now.
 
- Please help me understand how what we are doing is determining the cause of the problem.
 
- All I understand is an attempt to make the problem go away but the attempts are no different than what I had said I had already tried.
 
- The attempts are are no different than the attempts explained by myself and others on the TP-Link forum: https://community.tp-link.com/en/business/forum/topic/581548?page=10 as I previously stated.
 
-  We are doing the same things over and over
 
 - What new thing can we try? .
 
Response:
 

If you tried Ping 8.8.8.8 and get a result of lost all packets, that means Ping is fail. 

And when problem happened, please check if you get an invalid IP. (The IP like 169.254.X.X is invalid IP)

If all the troubleshooting is done and you get the above two results. You can go to Amazon for a return or exchange process. 

(Because your product is still under the Amazon warranty, we recommend that you give priority to Amazon for a return or exchange.) 

 

Thanks for your patience and cooperation. Wish you have a nice day!

 

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#136
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