DHCPv6
DHCPv6 vs. DHCPv4 Message Types Comparison
A comparative view of DHCPv6 and DHCPv4 message types is presented in the table below:
| DHCPv6 Message Type | DHCPv4 Message Type |
|---|---|
Solicit (1) | DHCPDISCOVER |
Advertise (2) | DHCPOFFER |
Request (3), Renew (5), Rebind (6) | DHCPREQUEST |
Reply (7) | DHCPACK / DHCPNAK |
Release (8) | DHCPRELEASE |
Information-Request (11) | DHCPINFORM |
Decline (9) | DHCPDECLINE |
Confirm (4) | none |
Reconfigure (10) | DHCPFORCERENEW |
Relay-Forw (12), Relay-Reply (13) | none |
Detailed Explanation of DHCPv6 Message Types:
Solicit (1): Initiated by a DHCPv6 client to find available servers.
Advertise (2): Sent by servers in response to a Solicit, indicating availability for DHCP service.
Request (3): Clients use this to request IP addresses or prefixes from a specific server.
Confirm (4): Used by a client to verify if the assigned addresses are still valid on the network, typically after a network change.
Renew (5): Clients send this to the original server to extend address lifetimes or update configurations.
Rebind (6): Sent to any server to extend address lifetimes or update configurations, especially when no response is received to a Renew.
Reply (7): Servers use this to provide addresses, configuration parameters, or to acknowledge messages like Release or Decline.
Release (8): Clients inform the server to stop using one or more assigned addresses.
Decline (9): Sent by clients to report that assigned addresses are in conflict on the network.
Reconfigure (10): Servers prompt clients to initiate transactions for new or updated configurations.
Information-Request (11): Clients request configuration parameters without IP address assignment.
Relay-Forw (12): Relay agents forward messages to servers.
Relay-Repl (13): Servers reply to relay agents, who then deliver the message to the client.
References
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