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Forum Discussion
DHCP not working properly, log filling with DHCP assignments
So I have noticed that after rebooting, sometimes DHCP doesn't work properly. No devices that use DHCP, whether they have a DHCP reservation or not, get DHCP assigned IP addresses. Whenever this prob...
DougB628 wrote:
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To me, it seems that the problem lies in the DHCP Offer packet sent in response to the DHCP Discover packet from the client. The client, for whatever reason, either doesn't get the DHCP Offer packet, or can't read it properly.
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DougB628 Thanks for doing a thourough troubleshooting anf for the good analysis.
I'd look at this differently. I think that the fact that Orbi does not reply to the DHCP Discover packets makes me think that those packets were really sent to another element in the network. Does the ISP modem/router provide any routing functionality? Do you have any other network elements (like extenders, repeaters, ...) that can supply DHCP functionality that can cause such an issue?
Oh - one more thing - the Orbi is definitely replying - I see tons of DHCP Offer lines in the Wireshark log coming from the Orbi. It's the clients that are not sending the DHCP Request after that that is not happening when this is not working. When it is working, I see the following sequence for each device:
Device Orbi
DHCP Discover------>
<-----------DHCP Offer
DHCP Request------>
<------------DHCP Ack
When it is not working, The client sends the DHCP Discover, the Orbi sends the DHCP Offer, but most of my devices are not sending the DHCP Request after that. So it breaks down at that point.
Western Digital My Cloud 4TB NAS
Toshiba Satellite Laptop
Apple Mac Mini
Philips Hue Bridge
Lenovo Desktop PC
Raspberry Pi 3
D-Link NVR-312L network video recorder - capable of doing DHCP, but is disabled
Tablo OTA DVR
Apple Time Capsule (all wireless disabled, running in bridge mode so no NAT or DHCP)
I confirmed the configurations of the NVR-312L and the Time Capsule prior to sending this.
DougB628 wrote:
Western Digital My Cloud 4TB NAS
Toshiba Satellite Laptop
Apple Mac Mini
Philips Hue Bridge
Lenovo Desktop PC
Raspberry Pi 3
D-Link NVR-312L network video recorder - capable of doing DHCP, but is disabled
Tablo OTA DVR
Apple Time Capsule (all wireless disabled, running in bridge mode so no NAT or DHCP)
I confirmed the configurations of the NVR-312L and the Time Capsule prior to sending this.
- I have an Apple Time Capsule bridged wired to my satellite and I know that it behaves well.
- I also have a D-Link repeater which has DHCP disabled but I see that few devices -sometimes- get IP addresses from the default DHCP range in the D-Link.
I'd test to disconnect -if possible- all wired devices and try without them. I suspect the D-Link but it can be any other wired device as well. :)