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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:
- 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
- https://support.huawei.com/enterprise/en/doc/EDOC1100306163/d427e938/introduction-to-dhcpv6-messages
Learn AWS hacking from zero to hero with htARTE (HackTricks AWS Red Team Expert)!
Other ways to support HackTricks:
- If you want to see your company advertised in HackTricks or download HackTricks in PDF Check the SUBSCRIPTION PLANS!
- Get the official PEASS & HackTricks swag
- Discover The PEASS Family, our collection of exclusive NFTs
- Join the 💬 Discord group or the telegram group or follow us on Twitter 🐦 @hacktricks_live.
- Share your hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.