opn_update_dnsmasq_range

THE RISK

Medium Risk

Why opn_update_dnsmasq_range needs a policy

The 'update' action on dnsmasq ranges (likely DHCP or DNS service configuration) creates or modifies network service data reversibly. This falls under Write category rather than Execute because it configures services rather than running arbitrary commands. Severity is medium because misconfiguration could disrupt network services or DHCP/DNS resolution for clients, but changes are reversible.

From the tool's definition Tool name 'opn_update_dnsmasq_range' indicates modification of dnsmasq configuration ranges. Sibling tools include 'opn_add_dnsmasq_range' (Write category), and the 'update' verb suggests reversible modification of network configuration settings.

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

POLICY

How to control opn_update_dnsmasq_range

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_update_dnsmasq_range:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "opn_update_dnsmasq_range": {
      "limits": [
        {
          "counter": "opn_update_dnsmasq_range_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

opn_update_dnsmasq_range stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

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Add this policy — paste it, or build it visually.
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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about opn_update_dnsmasq_range

What does the opn_update_dnsmasq_range tool do? +

opn_update_dnsmasq_range. It is categorised as a Write tool in the OPNsense MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on opn_update_dnsmasq_range? +

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

opn_update_dnsmasq_range is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit opn_update_dnsmasq_range? +

Yes. Add a rate_limit block to the opn_update_dnsmasq_range 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_update_dnsmasq_range completely? +

Set action: deny in the PolicyLayer policy for opn_update_dnsmasq_range. 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_update_dnsmasq_range? +

opn_update_dnsmasq_range 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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