Prevođenje mrežnih adresa

The development of the Internet and of the TCP/IP communication model made end-toend network communication possible using IPv4 addressing. Due to the rapid growth of the Internet, now there are no more free unallocated unique IPv4 addresses. Nevertheless, today these IPv4 addresses are still the most used ones due to the implementation of NAT technology, i.e. network address translation. By replacing the source or destination IP address NAT allows the local networks the application of the private set of IP addresses for internal communication and public set of IP addresses for external communication. According to the available literature, the operation of several types of NAT technologies has been explained as well as the methods of implementation, terminology related to NAT and its advantages and disadvantages. By simulating and testing of dynamic and static NAT on the right equipment the literature part of the paper has been confirmed. In the paper three public IP addresses with the three local IP addresses have been statically mapped in the test network using the MikroTik router. By dynamic mapping one public IP subnets has been connected to one local subnet using the NAT rules in the MikroTik router.