Originally Posted by satimis
What is the reason for ISP to lock IP address 192.168.0.1 on the router which is on my LAN.
There are three IP ranges which are strictly for internal usage and which should never be exposed to the internet. The ranges are
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
As you can see your IP address is in this range. It's private space and is used behind a router. The router uses the NAT protocol to translate multiple internal IP addresses to the external address, and directs returning packets back to the originator. Maybe this
will give you a start with how and why.