<Dd> The DHCP server issues a private IP address dependent upon each client's MAC address, based on a predefined mapping by the administrator . This feature is variously called static DHCP assignment by DD - WRT, fixed - address by the dhcpd documentation, address reservation by Netgear, DHCP reservation or static DHCP by Cisco and Linksys, and IP address reservation or MAC / IP address binding by various other router manufacturers . If no match for the client's MAC address is found, the server may or may not optionally fall back to either Dynamic or Automatic allocation . </Dd> <P> DHCP is used for Internet Protocol version 4 (IPv4), as well as for IPv6 . While both versions serve the same purpose, the details of the protocol for IPv4 and IPv6 differ sufficiently that they may be considered separate protocols . For the IPv6 operation, devices may alternatively use stateless address autoconfiguration . IPv6 hosts may also use link - local addressing to achieve operations restricted to the local network link . </P> <P> In 1984, the Reverse Address Resolution Protocol (RARP), defined in RFC 903, was introduced to allow simple devices such as diskless workstations to dynamically obtain a suitable IP address . However, because it acted at the data link layer it made implementation difficult on many server platforms, and also required that a server be present on each individual network link . RARP was superseded by the Bootstrap Protocol (BOOTP) defined in RFC 951 in September 1985 . This introduced the concept of a relay agent, which allowed the forwarding of BOOTP packets across networks, allowing one central BOOTP server to serve hosts on many IP subnets . </P> <P> DHCP is based on BOOTP but can dynamically allocate IP addresses from a pool and reclaim them when they are no longer in use . It can also be used to deliver a wide range of extra configuration parameters to IP clients, including platform - specific parameters . DHCP was first defined in RFC 1531 in October 1993; but due to errors in the editorial process was almost immediately reissued as RFC 1541 . </P>

Which types of ip address is assigned to the dhcp server