DHCP: Dynamic Host Configuration Protocol

DHCP messages are encapsulated in UDP datagrams.

DHCP overview:

  • Host broadcasts “DHCP discover” msg [optional]
  • DHCP server responds with “DHCP offer” msg [optional]
  • Host requests IP address: “DHCP request” msg
  • DHCP server sends address: “DHCP ack” msg

DHCP can return more than just allocated IP address:

  • Address of first-hop router
  • Name and IP address of DNS server
  • Network mask
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