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DHCP autoconfiguration means a device gets network settings from a DHCP service instead of having every setting entered manually. A DHCP server can supply an IP address and other configuration parameters. The address is not necessarily temporary: DHCPv4 supports permanent automatic assignments, time-limited dynamic leases, and administrator-assigned addresses.
What DHCP autoconfiguration means
DHCP, or Dynamic Host Configuration Protocol, is a client-server protocol for delivering configuration information to network hosts. When a device joins a network, its DHCP client requests configuration; a DHCP server responds with an offer, and the client requests the configuration it will use. The server’s policy determines what is available, including address pools, reservations, and options. RFC 2131 defines DHCP’s purpose and exchange.
The term “autoconfiguration” describes how the device receives its settings, not a guarantee that it will reach the Internet. DHCP can provide settings such as an address and other network parameters, but it does not itself provide Internet service, perform DNS registration, or configure routers.
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No. DHCPv4 defines three address-allocation methods, so an automatically configured address is not always a temporary lease:
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| DHCPv4 allocation method | What happens |
|---|---|
| Automatic | The server assigns the client a permanent address. |
| Dynamic | The server assigns an address for a limited period, or until the client relinquishes it. |
| Manual | An administrator assigns the address, and DHCP conveys it to the client. |
These allocation models are specified in RFC 2131. Whether a particular address changes depends on the server’s configuration and the network’s policy.
What happens when DHCP is unavailable?
If a device cannot obtain usable IPv4 configuration from DHCP, some operating systems or network configurations may use IPv4 link-local addressing. The host selects an address in 169.254/16, a mechanism defined separately from DHCP by RFC 3927.
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A 169.254/16 address supports communication only with devices on the same physical or logical link. It is not a routed address for reaching other networks or the Internet. Seeing one can therefore indicate that ordinary routable IPv4 configuration was unavailable, although fallback behavior varies by system and network.
Is DHCP the same as IPv6 SLAAC?
No. SLAAC, or Stateless Address Autoconfiguration, is an IPv6 mechanism in which a host forms an address using a network prefix and an interface identifier; it also generates an IPv6 link-local address. SLAAC can enable local communication without a DHCPv6 server on the link. See RFC 4862.
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DHCPv6 is a separate protocol for supplying IPv6 network parameters, addresses, and prefixes. The current specification, RFC 9915, published in January 2026, obsoletes RFC 8415 and allows DHCPv6 to operate alongside SLAAC or in its place. The two methods are therefore not universally exclusive.
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