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DHCP

DHCP in a VPC

The Dynamic Host Configuration Protocol (DHCP) provides a standard for passing configuration information to hosts on a TCP/IP network. The options field of a DHCP message contains configuration parameters, including the domain name, domain name server, and the netbios-node-type.

When you create a VPC, AWS automatically create a set of DHCP options and associate them with the VPC. You can configure your own DHCP options setfor your VPC.

  • Once created, DHCP option sets cannot be modified IMMMUTABLE
  • DHCP option sets can be associated with 0 or more VPCs
  • One VPC can have only 1 max Option Set
  • Associating a new option set is immediate - but changes require a DHCP Renwe which takes time
  • Default Gateway - subnet + 1
  • DNS Server - VPC + 2 (by default R53 Resolver)

dncp-in-vpc