Work of DHCP Dynamic Host Configuration Protocol and PAT Port Address Translation

Work of DHCP Dynamic Host Configuration Protocol and PAT Port Address Translation address translation router converts port address dhcp server.

DHCP – Dynamic Host Configuration Protocol

  • DHCP server is configured with a range of addresses
  • Host 3 boots up and enters Initialize state
  • It broadcasts a DHCP Discover message
  • Then enters Select state
  • DHCP servers send DHCP offer message
  • Host 3 sends a DHCP request to one of the servers
  • Host 3 enters the Request state
  • DHCP server responds with a DHCP ack (with address)
  • Host 3 enters the Bound state, accepting the lease

Network Address Translation – NAT

Operates at the edge of a company network, Converts the private IP addresses into one or more public addresses

Several flavours:

  • Fixed private to public relationship – Static NAT
  • Demand-based – when a private address needs external access, an address is taken from a pool of public ones and the conversion done at the edge router – Dynamic NAT
  • Overload NAT – also called PAT – Port Address Translation

dhcp in ip address

PAT – Port Address Translation

  • User on IP Address ‘p’ and port ‘r’ sends packet for the outside
  • Router converts this to IP address ‘w’ and port 36578
  • Reply comes back for ‘w’ and 36578
  • Router converts this to address ‘p’ and port ‘r’
Article Topics :

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