opn_dns_stats

THE RISK

Low Risk

Why opn_dns_stats needs a policy

This tool retrieves DNS resolver statistics (queries, cache hits, uptime) from the Unbound resolver. It performs a read-only operation that queries existing data without creating, modifying, deleting, or executing any operations. The verb 'Get' and the nature of statistics retrieval confirm this is a Read category tool with low blast radius if misused by an AI agent.

From the tool's definition Tool name and description: 'Get Unbound DNS resolver statistics (queries, cache hits, uptime)' - retrieves and queries statistics data with no modification or side effects.

Documented attack patterns abuse exactly the kind of access opn_dns_stats gives an agent:

POLICY

How to control opn_dns_stats

PolicyLayer is an MCP gateway — it sits between your AI agents and OPNsense MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for opn_dns_stats:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "opn_dns_stats": {}
  }
}

opn_dns_stats is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register OPNsense MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about opn_dns_stats

What does the opn_dns_stats tool do? +

Get Unbound DNS resolver statistics (queries, cache hits, uptime). It is categorised as a Read tool in the OPNsense MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on opn_dns_stats? +

Register the OPNsense MCP Server MCP server in PolicyLayer and add a rule for opn_dns_stats: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches OPNsense MCP Server. Nothing to install.

What risk level is opn_dns_stats? +

opn_dns_stats is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit opn_dns_stats? +

Yes. Add a rate_limit block to the opn_dns_stats rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block opn_dns_stats completely? +

Set action: deny in the PolicyLayer policy for opn_dns_stats. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides opn_dns_stats? +

opn_dns_stats is provided by the OPNsense MCP Server MCP server (lucamarien/opnsense-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every OPNsense MCP Server tool call.

Start from OPNsense MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →