I am using Windows 7. Here is a correct
ipconfig which helps me connect to Internet:
IPv4 Address 192.168.1.100 Subnet Mask 255.255.255.0 Default Gateway 192.168.1.254
It happens so often that in the morning when I first turn on my computer, the Default Gateway was assigned as
192.168.1.252 so I could not connect to Internet and had to set a static Default Gateway myself.
There are two IPs that my default gateway is randomly assigned:
192.168.1.254 (correct) 192.168.1.252 (incorrect)
I don't know where the value of 192.168.1.252 comes from. I can not
ping 192.168.1.252. I checked on my router setup page (192.168.1.254) but could not find any proof.