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Advantages and Disadvantages of NAT

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  • Last Updated : 18 Oct, 2021
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NAT(Network Address Translation) is a process that is used for converting a single IP address space into a global one. This works with a router or firewall that interconnects two networks. We can connect many network address translations into an intranet with the help of a single public address. This method is mainly introduced to prevent address space exhaustion.  

Many organizations used to have NAT as they want to have multiple devices to use a single IP address. In networking systems, it doubles the security of its features and addresses translation. In some cases, it will be useful for us and in some they don’t.

Benefits :
Some of the benefits are:

  • It allows you to rescue the private IP address.
  • It has got good security features that enhance the security of private networks by separating the internal network from the external network.
  • It helps to conserve the IP address space. You can connect a large number of hosts using a small IP address to the global internet.

Advantages :

  1. Lowers the cost –
    When any organization uses NAT with their private IP address, they don’t need to buy a new IP address for all the computers they have in their organization. They can use the same IP address for multiple computers out there. This will help to reduce the cost of the organization.
     
  2. Conserving Address –
    When you use NAT overload, it will allow you to preserve the IPv4 address space which will give access to all the privatization of intranets. Here, it can be done with the help of Intranet Privatization. In this process, they used to save all the addresses at the port level in multiple applications.  
     
  3. Connection Flexibility –
    NAT has multiple tools, load balancing tools, and backup tools. These tools will help to increase the overall reliability and flexibility of the network. It will happen when we establish any connection either in the public or any of their connections.
     
  4. Consistency in the Network –
    It has a scheme called consistent network addressing. It has a proper address space assigned for the use of public IP addresses. This happens because when we enlarge the network, then more IP addresses will be required.
     
  5. Network Security –
    In-Network Address Translation all your original source and destination sources will be hidden by them completely. Without the user’s permission, so that the hosts inside them will not be reached by other hosts in the network. This proves that they have got additional security.
     
  6. Private Addressing –
    They have a private IPv4 addressing system that is owned by them. So, if you move to another addressing system, they will still have their own addressing system. If the user changes the internet service provider, it will prevent the internal address changes in them.

Disadvantages :

  1. Issues in the Performance –
    For example, if a guest makes a request to the remote server, it will first check and confirm whether the connection belongs to the NAT server or not. Also, some hosts used to perform security mechanisms for the number of requests that can be accepted. If the number exceeds, they cannot make any further requests. In real-time protocols, this will create performance degradation.
     
  2. Application Use –
    Sometimes hosts inside the network might be unreachable. Because of this, some applications in the NAT will have compatibility issues. This will depend on end-to-end functionality which some networks will fail to supply them.
     
  3. Usage of Protocols –
    The values inside the headers can be changed in NAT, some of the tunneling protocols such as IPsec will be very complicated to use. When you modify the values inside the headers, then integrity checks will occur, which will interfere and fail them.
     
  4. Service Use –
    When you use NAT, services such as TCP or UDP will be required. These services will be affected while using which makes them unstable. Also, incoming packets will have some issues while they try to reach their destination. We can stop this issue by configuring them with the NAT router.
     
  5. Usage of Memory –
    NAT will examine the data packets of the incoming and outgoing services. They will convert the data packets into local and global IP addresses as well. Inside the memory, the translation details will get stored. This in turn will consume lots of memory as well as processor.
     
  6. Troubleshooting Issues –
    When you use NAT, the end-to-end traceability will be reduced. Also, the IP address will be constantly changed multiple times. This in turn will make troubleshooting more difficult. In some cases, it will be more impossible especially when you are in remote locations.  
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