Managing IPv6 reverse DNS with PTR, CNAME and delegated networks
Summary
Manuel Schmitt describes joint IPv4 and IPv6 reverse DNS management with search, CSV export and delegation of entire IPv6 networks. The editor supported PTR, CNAME and NS records for IPv6. CSV exports also contained addresses in binary notation.
Ideas
- A shared editor prevents separate operational paths for IPv4 and IPv6.
- Addresses shown in binary make it easier to sort large exports correctly.
- NS records delegate a /64 or smaller subnets to customers’ own name servers.
- With large IPv6 address spaces, filters and search become more important than manual lists.
Insights
- IPv6 management only scales with network-oriented tools instead of thinking in single addresses.
- Reverse DNS is operational infrastructure for mail, diagnosis and delegated responsibility.
Facts
- As an example, the article names the delegation of a /64 and its subdivision down to a /80.
Recommendations
- Automate forward and reverse DNS checks together.
- Delegate only clearly delimited prefixes and monitor the authoritative name servers.
References
Read the original article on Hostblogger
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