hacktricks/generic-methodologies-and-resources/pentesting-network/dhcpv6.md

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


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