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Handling Unknown DHCPv6 Messages

Handling Unknown DHCPv6 Messages. draft-ietf-dhc-dhcpv6-unknown-msg-01 Y. Cui, Q. Sun , T. Lemon IETF 87 th @Berlin. Problem Statement. RFC3315 is not specific about: How the relay agent can determine to relay toward the server or the client

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Handling Unknown DHCPv6 Messages

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  1. Handling Unknown DHCPv6 Messages draft-ietf-dhc-dhcpv6-unknown-msg-01 Y. Cui, Q. Sun, T. Lemon IETF 87th@Berlin

  2. Problem Statement • RFC3315 is not specific about: • How the relay agent can determine to relay toward the server or the client • What the relay agent should do when receiving an unknown DHCPv6 message • What the client and server should do when receiving an unknown DHCPv6 message

  3. Relay Agent Behavior Update • A valid message to construct a new Relay-forward msg • RFC3315 doesn’t define what a valid message is • Valid Message: if a relay agent receives the message, but the relay agent does not identify itself as the target of the message, and the message is not a Relay-Reply message. • Relay messages according to the message type • Relay-forward: Toward the server • Relay-reply: Toward the client, regardless of the message type in Relay Message Option • Unknown types: Toward the server

  4. Reasons for Definition of a Valid Message • Any message received by a client or server is clearly not a candidate for forwarding. • Any message received by the relay in response to a message it has sent to the server-e.g., a RECONFIGURE-REPLY message-is also not a candidate for forwarding. • A standards-compliant DHCP server will never send a message to a relay other than in response to a message from a relay, so there should never be a case where a relay receives a message for which it is the intended recipient, but is not able to recognize that it is the intended recipient for the message. • A Relay-Reply message is an encapsulation intended for the client or for a relay agent closer to the client. It specifies a destination, and hence is never to be encapsulated and sent back to the server.

  5. Client/Server Behavior Update • Client and Server MUST discard the messages with unknown types

  6. Next Step • Compliant to future extensions to DHCPv6 • E.g. dhcpv4 over dhcpv6 • … • Minor issues • Usage of ‘recipient’ / ‘intended recipient’ may cause confusing (RESOLVED) • Explanations to the definition of ‘a valid message’ • Last Call?

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