opn_list_dnsmasq_ranges

THE RISK

Low Risk

Why opn_list_dnsmasq_ranges needs a policy

This tool retrieves dnsmasq range data without modifying state. While the description is empty, the naming convention 'list_' strongly suggests a query operation typical of Read category tools. The severity is low because listing DHCP ranges poses minimal risk—it retrieves configuration data without side effects or irreversible actions.

From the tool's definition Tool name 'opn_list_dnsmasq_ranges' indicates listing/querying dnsmasq range configurations. The 'list' verb and lack of modification keywords (add, delete, update) indicate a read-only operation.

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

POLICY

How to control opn_list_dnsmasq_ranges

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_list_dnsmasq_ranges:

policy.json

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

opn_list_dnsmasq_ranges 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.

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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.
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FAQ

Questions about opn_list_dnsmasq_ranges

What does the opn_list_dnsmasq_ranges tool do? +

opn_list_dnsmasq_ranges. 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_list_dnsmasq_ranges? +

Register the OPNsense MCP Server MCP server in PolicyLayer and add a rule for opn_list_dnsmasq_ranges: 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_list_dnsmasq_ranges? +

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

Can I rate-limit opn_list_dnsmasq_ranges? +

Yes. Add a rate_limit block to the opn_list_dnsmasq_ranges 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_list_dnsmasq_ranges completely? +

Set action: deny in the PolicyLayer policy for opn_list_dnsmasq_ranges. 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_list_dnsmasq_ranges? +

opn_list_dnsmasq_ranges 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.

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