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DHCP (Lease Renewal (sent at 50% of lease duration, unicast DHCPREQUEST to…
DHCP
Lease Renewal
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Renewal resets the lease time. DHCP server responses with DHCPACK. This may contain new configuaration information
If no response is recieved the client will broadcast a DHCPREQUEST at 87.5% of lease time, attempting to maintain the existing IP address
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DORA
Discover
Ethernet Broadcast, DHCPDISCOVER
Offer
Response DHCPOFFER from DHCP server, Includes IP address
Request
Recieves offers from all DHCP servers, sends a request DHCPREQUEST to the first one to respond, accepting its offer
Acknowledge
Server either records allocation and accepts request, sending a DHCPACK, or if the address is no longer available sends a DHCPNACK
Lease Validation
When a client restarts (within the lease duration) it sends a DHCPREQUEST, to confirm its lease, and obtain any new configuration
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if the GW does not response, it will restart the DORA process
Relay Agents
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Agent listens for DHCP broadcasts, and forwards them (unicast) to preconfigured DHCP server(s)
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