My understanding is that it's a heterogeneous system that does different things for different people at different times. Looks like Wikipedia has some technica

My understanding is that it's a heterogeneous system that does different things for different people at different times. Looks like Wikipedia has some technical details- https://en.wikipedia.org/wiki/Great_Firewall#Blocking_methods https://en.wikipedia.org/wiki/Great_Firewall#Blocking_method...