I have this schematic LAN config :

I’m using PC 1, and after i update some software, restart the Computer, suddenly i can’t connect to the internet. So i tried “ipconfig /renew”, tried “ipconfig /release” then “ipconfig /renew”, tried unplugging network cables, tried disabling local network adapet, it’s no use. I can ping to my local network but can’t ping to internet. And i try typing ipconfig /all and i see there’s Deafult Gateway 0.0.0.0

i search google for the problem and find the solusion using netsh
just type :

where a.b.c.d is your local ip address. And my internet is back online.