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ER707 No longer handing out DHCP addresses on VLAN enabled ports

ER707 No longer handing out DHCP addresses on VLAN enabled ports

ER707 No longer handing out DHCP addresses on VLAN enabled ports
ER707 No longer handing out DHCP addresses on VLAN enabled ports
2025-05-02 15:49:31 - last edited 2025-05-07 00:51:28
Tags: #VLAN & Multi-Networks #DHCP Service
Model: ER707-M2  
Hardware Version: V1
Firmware Version: 1.2.2 Build 20240324

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EDIT 5/6/25 - I was bit by the refresh bug. Resolution involved simply resetting the port back to a different VLAN for a moment and then setting back to the required VLAN. Totally unacceptable that this is even a problem. It persisted through multiple reboots. 

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After the recent firmware upgrade, clients connected directly to the ER707 stopped working. Troubleshooting revealed I'm no longer getting IPs from any client connected to a port with an assigned VLAN ID. Naturally, I thought the upgrade caused it so, I downgraded to the previous firmware. This doesn't seem to have solved the problem and I'm completely stumped.

 

Troubleshooting steps:

 

Confirmed all LAN setups - Proper ranges, gateways and DHCP enabled
Confirmed all switch profiles - VLAN untagged
Confirmed port setup - Proper VLAN assigned
Confirmed direct connection to router - No IP received on any port
Full power down and restart of entire network - Modem, ER707, SG2210XMP, EAPs


What's odd is that the uplink from the ER707 to the SG2210XMP is working fine. The switch ports are handing out DHCP for the specific VLAN exactly as intended. I'm pending a reboot after disabling "hardware offload" as I've heard it can cause strange behavior.

 

Has anyone experienced the ER707 simply stopping the handout of IPs via DHCP? If so, and you solved it, what was the cause? I've got Omada support looking into it as well but on first review, they can find nothing wrong.

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5 Reply
Re:ER707 No longer handing out DHCP addresses on VLAN enabled ports
2025-05-06 01:51:56 - last edited 2025-05-07 00:51:28

Hi @KRUTE 

Thanks for posting in our business forum.

Looks like you did not configure the router VLAN properly.

As you said, the link between the switch and the router works fine. Yeah, because these are two devices that know how to deal with the VLAN regardless it is tagged or not.

Assuming you need to re-examine your VLAN config with the guide:

How to Set Up VLAN Interface on the Omada Router

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Re:ER707 No longer handing out DHCP addresses on VLAN enabled ports
2025-05-06 07:20:53 - last edited 2025-05-06 07:23:15

  @KRUTE 

 

Things to check:

 

- Are all VLANs assigned (in the edit networks screen) to the router port that the switch is uplinked to

- Does the switch>router uplink port use either the "All" or a custom profile with all vlans in it (management untagged, the rest tagged) ?

- Do you have any switch ACLs that are blocking DHCP ports 67 and 68 ?

- Do you have any LAN<>LAN gateway or switch ACLs that might be blocking themselves to themselves ?

- Do you have any EAP ACLs that might be blocking their own access ?

- Are the DHCP ranges for each network actually correct ?

- Have you turned on MAC filtering to only accept connection from known MACs only ?

- Have you enabled IP-MAC binding to only allow what is in the list ?

- Have you enabled RADIUS and not included any MACs in the user list so nothing will authenticate?

 

and lastly

- If you connect a device with a static IP on a network associated with a switch port, can you ping internal devices and stuff on the internet?

 

Main: ER8411 x1, SG3428X x1, SG3452 x1, SG2428LP x1, SG3210 x1, SG2218P x1, SG2008P x3, ES208G x1, EAP650 x6 Remote: ER7206 v2 x1, ER605 v2 x3, SG2008P x2, EAP650 x2, ES205G x1 Controller: OC300
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Re:ER707 No longer handing out DHCP addresses on VLAN enabled ports
2025-05-06 11:46:49

  @Clive_A I'm using the OC200 to configure the VLANs and have already had TPL support confirm they're correct. Also, they've been working fine for nearly a year. The only change was a firmware upgrade. Yes, I downgraded. It did not work. Still, I appreciate the feedback and I'll look through the guide but I don't think setup is the issue.

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Re:ER707 No longer handing out DHCP addresses on VLAN enabled ports
2025-05-06 11:49:05

  @GRL Thank you for the constructive reply. I'll confirm each of these points. I do see one or two that apply so I'll look at those closely.

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Re:ER707 No longer handing out DHCP addresses on VLAN enabled ports
2025-05-07 00:53:30

Hi @KRUTE

KRUTE wrote

  @GRL Thank you for the constructive reply. I'll confirm each of these points. I do see one or two that apply so I'll look at those closely.

So what's your result on each point?

 

When you say it is caused by the upgrade, but now you have tried downgrading it as well. It persists.

Then this looks like a problem not residing on the router side.

 

Does your config sync to the router properly? OC200 V1 or V2? V1 is already too weak to support newer firmware on router/switch/AP.

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