Halwasia Request for Comments: S. Bhandari Category: Standards Track W.
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Halwasia, et al. Option address Language Problem Background and Scenario IANA Considerations Security Considerations Normative References Informative References Introduction This specification defines an optional mechanism and the related DHCPv6 option to allow first-hop DHCPv6 relay agents relay agents that are connected to the same link as the client to provide the client's link-layer address in the DHCPv6 messages being sent towards the server.
A DHCPv4 message header has 'htype' and 'chaddr' fields to specify the client link-layer address type and the link-layer address, respectively. The client link-layer address thus learned can be used by the DHCPv4 server and the relay agent in different ways.
In option address of the deployments, DHCPv4 servers use 'chaddr' as a customer identifier and a key for lookup in the client lease database. In service provider deployments, a typical DHCPv4 implementation will use the client link-layer address as one of the keys to build the DHCP client lease database. In dual-stack scenarios, operators need to be able Halwasia, et al.
The client option address address is such an identifier. However, none of these methods provide a simple way to extract a client's link-layer address.
This presents a problem to an operator who is using an existing DHCPv4 system with the client link-layer address as the customer identifier and who desires to correlate DHCPv6 assignments using the same identifier. Unfortunately, this specification requires modification of existing DHCPv4 clients, and has not seen broad option address in the industry indeed, we are not aware of any commercial implementations.
Providing an option in DHCPv6 Relay-Forward messages to carry the client link-layer address explicitly will help the above mentioned scenarios.
The option number currently in use is This memo documents the current usage of the option in agreement with RFCwhich declares that any pre-existing usages of option numbers in the range should be documented, and the Dynamic Host Configuration working group will try to officially assign those numbers to those options. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. It represents the consensus of the IETF community.
Further, having the client link-layer address in DHCPv6 will help by providing additional information for event debugging and logging related to the client at the relay agent and the server. The proposed option may be used in a wide range of networks; two notable deployment models are service provider and enterprise network environments.
TLS certificates can come from different sources. The format is host:port. New in 3. The keys are encoded as hex. These will usually be disabled or password protected in production deployments.
The mechanism option address in this document is not necessary in the case where the DHCPv6 server is connected to the same network link as the client, because the server can obtain the link-layer address from the link-layer header of the DHCPv6 message.
It is possible that there are other attacks that could be accomplished using this masquerading technique, although the authors are not aware of any. In some networks, it may be the case that the operator of the physical network and the provider of connectivity over that network are administratively separate, such that the Client Link-Layer Address option would reveal information to one or the other party that they do not need and could not otherwise obtain.
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It is also possible, in some cases, that a relay agent might communicate with a Halwasia, et al. In these cases, it is strongly recommended, in order to protect end-user privacy, that network operators use IPsec to provide confidentiality for messages between the relay agent and the DHCP server. References Standards Track [Page 7] Html markup produced by rfcmarkup 1.