Operate DNS, DHCP, and IPAM as one system. Use when a scope is exhausted, a resolver is poisoned, or a split-horizon zone is drifting from NetBox.
Scanned 9/5/2026
Install to Claude Code
Skills Directorynpx -y skills add gesh75/claude-skill-lint --skill dns-dhcp-ipam --agent claude-codeInstalls into .claude/skills of the current project.
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---
name: dns-dhcp-ipam
description: Operate DNS, DHCP, and IPAM as one system. Use when a scope is exhausted, a resolver is poisoned, or a split-horizon zone is drifting from NetBox.
argument-hint: "[scope-or-zone]"
allowed-tools: Read Grep
license: MIT
---
# DNS DHCP IPAM
Do not use for recursive resolver software internals. Not for public DNS marketing records.
## Procedure
1. NetBox is authoritative for prefixes and names. DHCP scopes are carved from NetBox, not from a spreadsheet.
2. Resolvers anycasted (TCP/UDP 53) behind two sites. Health-check the service, not just the VIP.
3. Split horizon: internal views never leak. External views never contain RFC1918.
4. Exhaustion: 80% lease use is a project, 95% is an incident. Scavenge stale first.
5. Verify: `dig +norecurse` against each NS, a new lease on a test port, PTR matches A.
```text
scope 10.24.12.0/24 leases 231/250 92%
action: reclaim 14 declined then expand from netbox prefix
```
## Anti-patterns
- Never add a forwarder to 8.8.8.8 "just for this app".
- Do not hand out public DNS as the only campus resolver.
## Safety
Zone edits are reviewed. DHCP option 43/66 changes can take a building down — twin first.
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