Request settings without a lease
06A device with an externally configured IPv4 address can request other configuration using DHCPINFORM.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 4.4.3 ↗
RFC 2131 · § 4.4.3EXAMPLE
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03
Apply the returned configuration.
The response supplies parameters without assigning an address or lease.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
RFC 1541RFC 2131 § 1.1
RFC 2131 adds DHCPINFORM for parameter-only configuration and removes the former minimum lease-time restriction.
Read the updated RFC section ↗Ask for settings without allocating another address.
- DHCPINFORM can carry a parameter-request list.
- The server returns DHCPACK with configuration options but does not allocate an address or provide lease timing.
- DHCP’s base protocol is not authenticated; rogue servers can supply misleading network configuration.
Options such as routers and DNS servers are defined in RFC 2132. Do not confuse DHCPINFORM with address allocation or lease renewal.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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