cannot get WAN on ER8411 to accept a DHCP response

cannot get WAN on ER8411 to accept a DHCP response

cannot get WAN on ER8411 to accept a DHCP response
cannot get WAN on ER8411 to accept a DHCP response
2024-04-04 16:02:16 - last edited 2024-04-04 23:27:35
Model: ER8411  
Hardware Version: V1
Firmware Version: 20231214

I took delivery of an ER8411 yesterday and started to set it up last night.

 

I managed to upgrade it to firmware 20231214 — apparently just moments before the release of 20240308.

 

I will likely upgrade to 20240308 tonight, but I don't have reason to believe that will make a difference for this issue.

 

I have not changed anything on the router (other than the admin password of course).

 

The two default WAN ports remain configured as Dynamic (which I take to mean DHCP).

 

I cannot get either port on the ER8411 to accept a DHCP response from a known-good TP-Link AC4000.

 

(I am connecting ER8411 to AC4000 merely to perform testing before deployment onto my ISP connection, which is 10G.)

 

A laptop will happily accept a DHCP response from the same AC4000. (It will also accept a DHCP response from ER8411.)

 

This router cannot be this badly broken. There must be something very dumb I am doing or have failed to do.

 

Any ideas welcome.

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SOLVED: cannot get WAN on ER8411 to accept a DHCP response-Solution
2024-04-04 23:27:31 - last edited 2024-04-04 23:27:35

The problem was that both the ER8411 and AC4000 wanted to "be" the same network.

 

ER8411 was detecting this and deliberaely rejecting the DHCP response from AC4000.

 

Once someone on Reddit suggested this, I checked the system log on ER8411, and sure enough there was the error.

 

I should have been smart enough to check the system log myself.

 

Anyway, it's fixed now. I gave ER8411 a different network and it joined the AC4000 just fine.

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SOLVED: cannot get WAN on ER8411 to accept a DHCP response-Solution
2024-04-04 23:27:31 - last edited 2024-04-04 23:27:35

The problem was that both the ER8411 and AC4000 wanted to "be" the same network.

 

ER8411 was detecting this and deliberaely rejecting the DHCP response from AC4000.

 

Once someone on Reddit suggested this, I checked the system log on ER8411, and sure enough there was the error.

 

I should have been smart enough to check the system log myself.

 

Anyway, it's fixed now. I gave ER8411 a different network and it joined the AC4000 just fine.

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