DHCPv6 - HackTricks

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### 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:

1. Solicit (1): Initiated by a DHCPv6 client to find available servers.
2. Advertise (2): Sent by servers in response to a Solicit, indicating availability for DHCP service.
3. Request (3): Clients use this to request IP addresses or prefixes from a specific server.
4. Confirm (4): Used by a client to verify if the assigned addresses are still valid on the network, typically after a network change.
5. Renew (5): Clients send this to the original server to extend address lifetimes or update configurations.
6. Rebind (6): Sent to any server to extend address lifetimes or update configurations, especially when no response is received to a Renew.
7. Reply (7): Servers use this to provide addresses, configuration parameters, or to acknowledge messages like Release or Decline.
8. Release (8): Clients inform the server to stop using one or more assigned addresses.
9. Decline (9): Sent by clients to report that assigned addresses are in conflict on the network.
10. Reconfigure (10): Servers prompt clients to initiate transactions for new or updated configurations.
11. Information-Request (11): Clients request configuration parameters without IP address assignment.
12. Relay-Forw (12): Relay agents forward messages to servers.
13. Relay-Repl (13): Servers reply to relay agents, who then deliver the message to the client.

## References

- https://support.huawei.com/enterprise/en/doc/EDOC1100306163/d427e938/introduction-to-dhcpv6-messages

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