04 type of NAT: 1. Full-cone NAT , also known as one-to-one NAT (NAT Toàn vành): Once an internal address (iAddr:iPort) is mapped to an external address (eAddr:ePort), any packets from iAddr:iPort are sent through eAddr:ePort. Any external host can send packets to iAddr:iPort by sending packets to eAddr:ePort. 2. (Address)-restricted-cone NAT (NAT Giới hạn địa chỉ) Once an internal address (iAddr:iPort) is mapped to an external address (eAddr:ePort), any packets from iAddr:iPort are sent through eAddr:ePort. An external host ( hAddr:any ) can send packets to iAddr:iPort by sending packets to eAddr:ePort only if iAddr:iPort has previously sent a packet to hAddr: any . "Any" means the port number doesn't matter. 3. Port-restricted cone NAT (NAT Giới hạn Cổng) Like an address restricted cone NAT, but the restriction includes port numbers. Once an internal address (iAddr:iPort) is mapped to an external address (eAddr:ePort), any pac
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