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Computer Network (CS2002)

Network Address Translation

Computer Science Department, SOA University

Dr. Rourab Paul

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Computer Netwrok

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NAT

Key Aspects of NAT Protocol:

  • Purpose: Primarily solves the IPv4 address shortage and adds a layer of security (hides internal private IP addresses from the public internet).
  • Operation: Acts on a router (between LAN and (Internet), modifying IP address information in the IP header of packets while in transit

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1. Static NAT

  • Maps one private IP to one public IP (one - to - one mapping).
  • Commonly used in hosting, but not cost - effective for large organizations since each device requires a public IP.

2. Dynamic NAT

  • Maps private IPs to public IPs from a predefined pool.
  • If the pool is exhausted, additional requests are dropped.
  • Suitable for networks with a limited number of users but still costly.

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Thank You

Computer Network

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