Validate a remembered address
04A restarted client can ask to reuse an earlier address. Remembering it does not establish that it remains valid on the current link.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 3.2 ↗
RFC 2131 · § 3.2EXAMPLE
3 / 3
03
Branch on the result.
ACK allows confirmed reuse; NAK means discard the configuration and restart discovery.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
Check old configuration before reuse.
- INIT-REBOOT sends DHCPREQUEST with the remembered address in the requested-IP option.
- In INIT-REBOOT the client does not include a server-identifier option and sets ciaddr to zero.
- An ACK confirms reuse; a NAK forces the client back to initialization.
Servers can stay silent when they lack enough knowledge. Retry and timeout rules matter; silence is not an explicit rejection.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
Privacy