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DHCP - Fixed IP Settings won't work

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DHCP - Fixed IP Settings won't work

DHCP - Fixed IP Settings won't work
DHCP - Fixed IP Settings won't work
2025-06-30 16:06:16
Tags: #DHCP Service
Model: ER605 (TL-R605)  
Hardware Version: V2
Firmware Version: 2.3.0

Hey there,

 

I am facing a very hard time trying to get fixed IP adresses working.

Nearly all my devices do not change their IP adress if I assign a static one. They will always get the one the initially got via DHCP when I replug the cable.

I tried everything - Forget, ban, unban the device etc.

 

What else can I do?

 

Thanks

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#1
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18 Reply
Re:DHCP - Fixed IP Settings won't work
2025-06-30 21:49:34

  @GaRv3 

 

Are you assigning the static IP addresses on the devices or are you assigning a reserved IP address on the DHCP server?

 

Static IP addresses assigned on the device will usually take effect when you reboot the device.  If you are using reserved IP addresses, the current address may not change until its lease period expires.

 

1x ER706W 1x OC300 4x SG2008 1x EAP610 2x EAP650
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#2
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 01:26:05

  @GaRv3 

This might be helpful in understanding how it works:

How Does DHCP Work? Common Questions and Solutions

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#3
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 09:27:59

Okay, so it was caused by an "old" TL-SG108E which was set to a static IP and messed up all the IPs of devices behind it. I set it to use DHCP and now all IP addresses have been correctly applied by Omada.

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#4
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 12:21:27 - last edited 2025-07-01 12:22:19

  @GaRv3 

It's still an issue. Devices connected to a switch (SG3428X-M2 v1.20) at a port configured with profile "All" will not receive an IP address outside of the "Default" VLAN.

Does DHCP not work for tagged networks?

 

Profile "All" contains all networks:

Profile "All" is assigned to the port:

The static IP is set and the wanted VLAN is assigned:

But the device stays in the "Default" Network and gets an IP within the subnet.

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#5
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 12:43:08

  @GaRv3 

 

Have you enabled vlan on the port connected to the switch? Check vlan interface settings

 

 

 

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#6
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 14:57:56 - last edited 2025-07-01 14:58:28

  @MR.S 

Yes, for the IoT VLAN all ports of the router are enabled.

 

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#7
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 15:58:18 - last edited 2025-07-01 15:59:42

  @GaRv3 

 

Do you have any switches between the router and the SG3428X-M2?

 

also check that the link port on SG3428X-M2 has profile all

 

 

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#8
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 18:30:35 - last edited 2025-07-01 18:39:08

  @MR.S 

No, the Switch is connected via port 2 to LAN4 of the router.

Port 2 is the router and port 10 is the one the devices are connected to. Between port 2 and the devices is an old TL-SG108E switch which should not change anything and the problem with the device also persist if I remove the switch.

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#9
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 18:38:29

  @GaRv3 

OK, if you have set port 2 in the switch to all, it should work then.

 

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#10
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Re:DHCP - Fixed IP Settings won't work
2025-07-01 18:41:04
I updated my last reply just as you answered. So this should work, right?
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#11
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