DHCPREQUEST every 5 seconds from same Win11 device

[NilsRo]

Hi,

my Windows 11 laptop floods the log as it requests DHCP every 5 seconds. It seems that it does not happen during normal use but if in power save mode. But not 100% sure...

Any ideas?

Regards,
Nils

Sun Mar 12 00:49:07 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:07 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:13 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:13 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:15 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:15 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:19 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:19 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:26 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:26 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:33 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:33 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:40 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:40 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:47 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:47 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:49:54 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:49:54 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:01 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:01 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:07 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:07 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:15 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:15 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:22 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:22 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:29 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:29 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:35 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:35 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:42 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:42 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:49 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:49 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:50:56 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:50:56 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:03 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:03 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:09 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:09 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:16 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:16 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:23 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:23 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:29 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:29 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:36 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:36 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:43 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:43 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706
Sun Mar 12 00:51:50 2023 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx
Sun Mar 12 00:51:50 2023 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.177.140 xx:xx:xx:xx:xx:xx Dell-7706

[jaromanda]

Probably a Windows 11 bug

[Mijzelf]

What does 'power save mode' mean?

[frollic]

That it saves power ?

[Mijzelf]

Fair enough. But how? Is it supposed to switch off the network interface?

[frollic]

Depends on the power mode used, I guess, but what's the point of having the network interface up if the computer is sleeping ?
The only reason I see, would be WOL.

[Mijzelf]

Yes, that is why I asked what 'power save mode' means. When I leave my laptop alone, it switches off the screen after x minutes. But AFAIK that is the only peripheral which is switched off. That is a power save mode. After some extra minutes it suspends to ram, and switches off network, sound, keyboard and maybe more. Another power save mode. But that is Limux. Don't know what kind of fancy power save modes W11 could have.
Maybe the network is supposed to be off, but somehow it thinks it should wakeup for a teams meeting, and polls the server every 5 seconds, and brings up the network for that.

[dl12345]

The client laptop is sending a DHCPREQUEST. It's just not seeing the ACK. So the interface is not powered down.

The DHCPREQUEST is a broadcast, which your server is seeing, as it's replying with a DHCPACK. So neither the client nor the server is filtering broadcast and multicast traffic.

The server is sending the unicast DHCPACK, which your client is not seeing. Something is filtering it out.

It's unlikely that the laptop network interface is selectively suspending incoming traffic (DHCPACK) but not suspending the outgoing traffic (DHCPREQUEST).

[grrr2]

@frollic

Depends on the power mode used, I guess, but what's the point of having the network interface up if the computer is sleeping ?

power save or standby mode is it?

[psherman]

Out of curiosity, is this network device wifi or ethernet? If ethernet, is it built-in or is it external (such as a USB-C docking hub)?

[NilsRo]

Its a WD19TB Dell Dockingstation with Realtek USB Ethernet Adapter build-in. It looks like it happens in standby and also hibernation... It is running with "Modern Standby". Its sometimes called "Connected Standby", perhaps it is a result by this mode...

[psherman]

I think the docking station has a bug... that's why I asked about a USB-C docking hub...

See this thread for another example (although this took down the entire network):

ATA and Apple TV lose connection thru switch

I identified the source of the problem to be a broadcast storm created by a Lenovo ThinkPad Hybrid USB-C dock (part number 40AF0135US). Online information indicates many docking stations of all make and model present with this problem, so I have had to discontinue use of a dock for now. I want to send my gratitude to @psherman for his generous sharing of time in helping me solve this problem.

[NilsRo]

Do not know it is the docking station itself but I fixed it with disabling network connection in modern standby. In the standard settings it holds network to do "in my opinion" unnecessary things like a mobile or tablet.