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Home/ Questions/Q 2680
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Vipin Chauhan
Vipin ChauhanLevel 30
Asked: August 3, 20212021-08-03T16:24:32+05:30 2021-08-03T16:24:32+05:30

For Static Nat To Work, How Many Inside Global Addresses Are Needed For Inside Local Addresses?

For Static Nat To Work, How Many Inside Global Addresses Are Needed For Inside Local Addresses?
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    1. Network Classmate Bronze
      2021-08-04T00:08:30+05:30Added an answer on August 4, 2021 at 12:08 am

      For static nat to work, how many inside global addresses are needed for inside local addresses?
      For every single local address, one single global address is needed. We all know that the basic definition of the NAT (Network Address Translation) is simply the modification of the IP addresses. The static translation is the type of explicit mapping that is between the translation IP addresses and the post-translation IP addresses.

      The main goal of the static network address translation is to make up the internal resource that should be externally accessible.
      Let us take an example, to understand this concept in detail. let us assume a topology consists of the internal net and the internal host.

      This consists of the IP address from 10 to 2.33. It also consists of the external host that is present somewhere on the internet. Here when the host tries to send a packet to the destination IP address of 10-2.33, this packet will be dropped on the internet. Because there is a rule on the internet that the communication only works on the internet from public IPS to the public IPS.

      Since this packet includes a private IP address, this packet gets dropped when it crosses the internet. But we have a resource on the inside of the network that needs excessively external. Then I would configure the router with the help of the static translation in order to make the internal resource that is externally accessible.

      In the above example that we discussed, we have configured a router to translate the IP address from 10 to 233 to the IP address 738 to 33. Now the external host can shoot a packet to the external IP addresses of 73 8 233. This allows the packet to cross the internet and to reach internal resources then the internal resource can respond. This is how the static network works.

      Now let us understand this topic a little more in detail. When this packet reaches the router, the router translates the destination IP address according to configuration 210 to 233. Here the router didn’t have to make any separate decisions and simply translate it. This is how the static translation works. We can notice that the only destination IP address has been changed. The below figure represents the working of the static Nat.

      When this packet hits by the internal source the internal source is responded by the response packet. when the response packet is determined the source and the destination fields get reversed i.e the source becomes the destination and the destination becomes the source.

      Here when the packet crosses the router, it will detect the Ip address in the static map configuration and translate the source IP addresses to the destination IP addresses by referring to the configuration. This is the basic operation of the static NAT.

      We can also say that it is an explicit mapping between two IP addresses. The Static NAT doesn’t see whether the addresses are private or public. The only common rule is that we must communicate with the public addresses, but we can configure the translation from a private address to a private address on the router.

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