I have an query regarding flow of IP packets from internet world to lte network(till PGW) . As during attach procedure, UE gets an IP addres. when an Ue want to access a website it sends a packet to external world and it reaches till PGW and PGW sent out to internet world over SGi interface. when website server in internet world receives a request from UE it sends reply back to UE. How reply packet will flow through IP network till PGW ? Is there any change happen in ip header of packet during flow?