Jenis-jenis NAT

Full cone NAT

 

 Full-cone NAT, also known as one-to-one NAT

• Once an internal address (iAddr:iPort) is mapped to an external address (eAddr:ePort), any packets from iAddr:iPort will be sent through eAddr:ePort.
• Any external host can send packets to iAddr:iPort by sending packets to eAddr:ePort.

Restricted cone NAT

 (Address) restricted cone NAT

• Once an internal address (iAddr:iPort) is mapped to an external address (eAddr:ePort), any packets from iAddr:iPort will be 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.

Port restricted cone NAT

 Port-restricted cone NAT
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 packets from iAddr:iPort will be sent through eAddr:ePort.
• An external host (hAddr:hPort) can send packets to iAddr:iPort by sending packets to eAddr:ePort only if iAddr:iPort has previously sent a packet to hAddr:hPort.

Symmetric NAT

 Symmetric NAT

• Requests from internal IP address and port pairs to different external IP address and port pairs are mapped to the external NAT address on a unique port. This also applies to all requests from the same host to different destinations.
• Only an external host that receives a packet from an internal host can send a packet back.

Sumber : www.wikipedia.org

Posted in: Networking