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This comtháng NAT method assigns a different TCP.. port number to lớn each client session with a hệ thống on the Internet. When responses come baông xã, the source port becomes the destination port & determines which user to route the packets to. It also validates that the incoming packets were requested. See TCP/IP port.
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(Network Address Translation) The technology that maintains the privacy of the addresses of the computers in a home page or business network when accessing the Internet. It converts the private addresses that are assigned khổng lồ the internal computers to one or more public addresses that are visible on the Internet (see private IP address). NAT is an IETF standard that is implemented in a router or firewall as well as in any user"s machine that is configured to chia sẻ its Internet connection (see ICS).NAT assigns a number lớn the packet headers of the messages going out khổng lồ the Internet and keeps traông xã of them via an internal table that it creates. When responses come bachồng from the Internet, NAT uses the table to lớn persize the reverse conversion lớn the private IPhường address of the requesting client machine (see illustration below).A First-Level FirewallNAT provides a small amount of security by keeping internal addresses hidden from the outside world. It prevents several kinds of first-màn chơi attacks, but not all, và it must be used in conjunction with the stateful inspection firewall built into lớn the router or personal firewall in each user"s machine. Enterprises generally use very robust firewall architectures for security (see firewall and firewall methods). See dynamic NAT.Not Enough IPhường AddressesWhen the Internet was first developed, its 32-bit IP address provided four billion discrete numbers, which proved woefully insufficient to lớn assign a quality number lớn every device that eventually became Internet enabled. With IP Version 6 (IPv6), there are sufficient numbers for everything on the planet; however, the original system (IPv4) is thoroughly entrenched. See IPv4 and IPv6.This comtháng NAT method assigns a different TCP.. port number to lớn each client session with a hệ thống on the Internet. When responses come baông xã, the source port becomes the destination port & determines which user to route the packets to. It also validates that the incoming packets were requested. See TCP/IP port.