My home WiFi,
Can't get ip using dhcp,
But static can...
Problem was my sis laptop need connect to other WiFi during study....
Which using dhcp.....
And she not tech savvy....
What the problem with dhcp?
I check my router ip pool still got left over free address unused...
I got reserve ip base on mac in router....

Is your sister's laptop is a MacBook running latest macOS ?

In macOS there is a feature to rotate Wifi mac address. This is to improve privacy. Looks like have to turn off feature to use DHCP.

https://support.apple.com/en-mt/102509

Windows 10 laptop...
My office some laptop also same....

don undersatnd, say home wifi, then outside wifi
reinstall wifi driver?

on windows 11 can random mac address, i not sure windows 10 got such option, my old windows 10 pc don have wifi, cannot test

make sure the laptop wifi IP and DNS is set to auto.
office laptop might have their on configuration setup by the IT Dept.


This post has been edited by soulz69: Oct 21 2025, 11:08 AM

Scan system for malware infection, next reset your Windows 10 network settings.

need connect to home & school wifi...
if set static ip (home)
school wifi cant connect unless remove the static ip

auto school wifi can connect
but home wifi can't connect, need static ip...

new notebook just full format....

have you try restart the router?

Try put DHCP lease time 28800.

restart also same....

already ...
if i remove the ip pool range..
and remove reserve ip...
will it solve or not...

If you assign fix Ip on router for that laptop

I can tell you what is the fucking problem and it has nothing to do with ip range or whatever.

It is all because of encryption with all these damn routers. When you had nothing much connected, the laptop negotiate highest speed with the router using WPA3. Then once you got lower end devices connected, the damn router will lower the encryption as backward compatibility. You can either goto the saved wifi network setting and set the encryption as WPA2, type your wifi password again. Or goto into your router, and change encryption to WPA2 only instead of WPA2/3

when at home, can your sister laptop receivde dhcp lease? what is the ip address? try troublehooting option?

then your laptop no issue?

try netsh winsock reset??

is the static ip at laptop is the same as the reserve ip?

already reserve ip for that laptop mac address

at home if dhcp, cant connect wifi..
need set ip address...

yes, same...

You should call your ISP and explain your situation to them. One of my customers encountered such an issue before, they called up the ISP and did something at their end, and it works after that.

some router, may left out the reserve ip from the dhcp list IP. you can clear the reserve ip or remove the laptop reserve ip

Make sure the DHCP service is running under Computer Management > Services.

cannot connect wifi can be the password is not correct?? what is the error when login to wifi

if wifi is connected, is there any DHCP leased from the router?

what dhcp ip address u get at home

i heard of this, not encounter WPA3 router yet

You have a really old wifi router? Most wifi6 router already had WPA3.

my 4 years old router already got WPA3, but i don use

forgot about this WPA3 thing, some older device cannot connect at all even password is correct, stuck on obtaining IP address..

password correct as if static ip can auto connect....

normal ...
192.168.0.XXX

----------------------
now remove the mac address from ip reserve...
it can connect using dhcp...

if everyone can use DHCP but only your sis cant
go to device manager, find the adapter, delete the driver and install it back by scanning hardware again.
But have a downloaded driver beside you just incase thing went south.

Uninstall the driver reset the wireless adapter settings.
Sometimes Windows provide their own version of driver but the driver may be too dated, try to download from vendor website if possible
eg D-link adapter, go to dlink website, WHQL driver most of the time just sucks

older device generally have more issue with new router, sometime you need to tinker abit with the router settings
for example my asus router, welp my old phone generally cant connect to tis 2.4GHz wifi, when it connects, it will disconnect after 1 seconds.
what i do is i change the wifi compatibility to auto, then use channel 7, only this channel works, channel auto select always use 1 or 12 to avoid congestion but it never worked for my phone

This post has been edited by 1024kbps: Oct 22 2025, 02:00 AM

WPA3 is new standard
older device can't connect, i think router have option to use wpa2/3, rather than force wpa3 but sacrifice security and increase router workload

Better put some screenshots of your router settings here.

so all good now?

So far ok...
Tonight see still ok or not...

Normally due to signal weak too far from router.

Y got reserve ip in the 1st place?

Signal just next room...

Yup got reserve ip...
But now remove it...
And it can connect via dhcp already....
Which very weird....

I think you just answered your question.

By reserving the IP in pool, you are not letting the IP available to DHCP server.

So that means no IP available.

All DHCP works with the following concept/syntax/settings, you just need to understand it :-

1. DHCP Server/IP Address = This are usually the router's IP Address (eg. 192.168.0.1)

2. DHCP Range [192.168.0.xxx - 192.168.0.254] = This are the range of IP Address that you want it to provide to authenticated devices. It is best practice to limit this range based on your devices. For example if you have a total of 10 devices in the house then limit the address to 20 or 50 (if you have frequent visitors coming over). So your range should be from 192.168.0.2 - 192.168.0.51.

Why ? Because some devices required Fixed IP Address, these are usually CCTV Recorder or Camera, Auto Gate, Alarm System, Server, Smart Home Controller etc. So you just need to ensure that these devices are using an IP Address that are NOT in the DHCP Range. Something like start from range 192.168.0.100 onwards.


3. DHCP Reserved IP Address = This might depends on router, some router will Ban/Denied access while some will Allowed the access. So you need to really read the instructions carefully and fully understand it. Simply by putting a MAC Address sometimes doesn't meant it will provide the same IP Address to the device. Sometimes it will just barred it from getting any access at all.

The Reserved IP Address must also NOT in the same DHCP Range and the IP address must also not conflict with any of the Fixed IP Address that you have manually assigned.


4. DHCP Leases / TTL = Total Time the assigned IP address will be valid to the computer. This will ensure a new IP address will be assigned each time the leases expired. Try to limit these also to like 7 days.

Why ? If you configure a very long IP address lease time, if that device belong a visitor and have left, that IP address is still valid & tied to that device. You will run out of IP Address very fast & existing device will have a hard time getting an IP address. Also you do not want these devices to be in your router for a very long time too. A standard 7-14 days will do the job and of course its up to you how long you want it.


Cheers...