Follow the private DOCSIS mapping example
05DOCSIS is a cable-network technology. The RFC’s example separates a cable operator that assigns an IP address from a reseller that already knows a modem’s EUI address.
Separate requester is not authorized for this private zone. The chosen access policy blocks record disclosure before an EUI answer crosses the boundary. No particular DNS error code is invented here.
Source for this drawing: RFC 7043 · Read RFC section 5 ↗
New to this? Start hereA quick picture + helpful background
A message needs an address.
Think of a packet as a small addressed envelope. Devices pass it onward; transport protocols decide what delivery promises an application gets.
Helpful first, if these ideas are unfamiliar
These pictures are analogies to help you learn. The linked RFC explains the actual rules.
Terms in this drawing
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
The example cable operator has DHCP lease information connecting an EUI-48 address and an assigned IP address; the reseller lacks direct knowledge of those IP assignments.
- The example cable operator has DHCP lease information connecting an EUI-48 address and an assigned IP address; the reseller lacks direct knowledge of those IP assignments.
- §5 describes exporting this mapping through DNS zones restricted to the appropriate resellers, with subscriber address data kept out of public DNS. This is the RFC’s documented deployment example, not current legal advice.
- Our private-view owner lease-42.example.org and its connection to 192.0.2.42 are chosen application fixtures. The RFC does not mandate this owner-name schema, an export transport or a lease-synchronization algorithm.
Fictional offline examples only. EUI records carry supplied address data; they do not authenticate devices, implement IP resolution or authorize tracking. RFC7043 is Informational. The application policies shown are explicitly chosen fixtures.
Read the RFC section ↗