opn_ndp_table

THE RISK

Low Risk

Why opn_ndp_table needs a policy

NDP tables are diagnostic network data used for IPv6 address resolution. Retrieving this information has no side effects and poses minimal risk. The empty description lowers confidence slightly, but the tool name and contextual sibling tools strongly indicate a read operation. Classified as Read due to lack of any modification, execution, or destructive capabilities.

From the tool's definition Tool name 'opn_ndp_table' suggests querying/retrieving NDP (Neighbor Discovery Protocol) table data. The 'table' suffix and naming convention align with similar read-only diagnostic tools like 'opn_arp_table' in the sibling tools list, which retrieves network…

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

POLICY

How to control opn_ndp_table

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_ndp_table:

policy.json

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

opn_ndp_table 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.
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_ndp_table

What does the opn_ndp_table tool do? +

opn_ndp_table. 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_ndp_table? +

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

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

Can I rate-limit opn_ndp_table? +

Yes. Add a rate_limit block to the opn_ndp_table 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_ndp_table completely? +

Set action: deny in the PolicyLayer policy for opn_ndp_table. 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_ndp_table? +

opn_ndp_table 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 →