Internet not working on one specific computer

[anvi123]

I just bought a LT700 Cudy router (4g-LTE) and I’m experiencing a strange issue.
I followed the initial configuration which was very straightforward, the only things I changed were the administrator password, wifi password and wifi name.
Everything was working fine, then for some reason my computer cannot get an IP and can’t connect to the internet.
Please note that: 1) I’m still able to connect to the router using my phone, tablet and a different computer, and everything works fine. 2) Even on my primary computer (the one that is not connecting), the wifi message says “connected” and the wifi icon shown is the one normally used when the pc is connected to the internet. 3) I tested with ipconfig/all, there is no IP address assigned, and ping cannot resolve internet domain names.

How is it possible that this problem only happens on one computer?
I already tried the following: reboot the router, reboot my pc, reset the router to factory default… nothing changes, my PC is the only device that doesn’t connect to the internet!

Thank you for your support
With regards
Andrea Vincenzi (from italy)

[anvi123]

Problem solved, the DNS in my computer for some reason was wrong. I went to the router settings and changed “custom DNS” to “override all client’s DNS”. Now internet is working again.

[BillA]

It's usually a simple solution to an elusive problem.
I always disable IPv6 both on the router's modem and LAN/WiFi interfaces, and the pc (just don't like IPv6 for some reason lol).
Then I set the DNS to 1.1.1.1 and 8.8.8.8 on both the router and pc's LAN/WiFi interfaces for better performance.
In a few cases when it still wouldn't work, so I ran the script below to reset the pc's network.
You can copy and paste it into a NetworkReset.bat file and make a shortcut on your desktop for easy access.
It works every time.

arp -d *
::
ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /release6
ipconfig /renew
ipconfig /renew6
::
nbtstat -R
nbtstat -RR
::
netsh int ip reset
netsh int ipv4 reset
netsh int ipv6 reset
::
netsh interface ip delete arpcache
netsh interface ip reset
::
netsh winsock reset
netsh winsock reset catalog
::
taskkill /F /IM explorer.exe
start explorer.exe