// MCP TOOL REFERENCE

test_network_connectivity

ServerLudus FastMCP
CategoryExecute

How to control test_network_connectivity ↓

WHAT TEST_NETWORK_CONNECTIVITY ON LUDUS FASTMCP DOES

AI agents invoke test_network_connectivity to trigger actions in Ludus FastMCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

THE RISK

High Risk

This tool actively runs network connectivity tests (ping, port scans, or similar probes) between VMs in a cyber range environment. It triggers external operations whose effects depend on arguments (source VM, target VM, protocol, port). This is Execute rather than Read because it actively sends network traffic/probes rather than simply querying stored data.

From the tool's definition Test network connectivity between VMs... Protocol to test (tcp, udp, icmp)... Optional port number for tcp/udp

Risk signalsAdmin/system-level operation

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

HOW TO CONTROL TEST_NETWORK_CONNECTIVITY

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "test_network_connectivity": {
      "limits": [
        {
          "counter": "test_network_connectivity_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

test_network_connectivity stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

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

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More Ludus FastMCP tools

Destructive abort_and_remove_range Abort any active deployment and then remove the range. This is a convenie Destructive batch_remove_snapshots Remove snapshots from multiple VMs in parallel. Args: vm_names: List Destructive bulk_vm_operations Perform bulk operations on multiple VMs. Args: operation: Operation t Destructive clear_range_access Clear all range access permissions. Args: user_id: Optional user ID ( Destructive delete_blueprint Delete a blueprint. Args: blueprint_id: ID of the blueprint to delete Destructive delete_group Delete a group. Args: group_name: Name of the group to delete Destructive delete_range Delete the entire range. Permanently removes the range and all associated VMs, sn Destructive delete_range_by_user delete_range_by_user

All 201 Ludus FastMCP tools →

Execute tools on other servers

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Go deeper

High-risk tools in Ludus FastMCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the test_network_connectivity tool do? +

Test network connectivity between VMs. Args: source_vm: Source VM name target_vm: Target VM name protocol: Protocol to test (tcp, udp, icmp) port: Optional port number for tcp/udp user_id: Optional user ID (admin only) Returns: Connectivity test result. It is categorised as a Execute tool in the Ludus FastMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on test_network_connectivity? +

Register the Ludus Fast MCP server in PolicyLayer and add a rule for test_network_connectivity: 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 Ludus FastMCP. Nothing to install.

What risk level is test_network_connectivity? +

test_network_connectivity is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit test_network_connectivity? +

Yes. Add a rate_limit block to the test_network_connectivity 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 test_network_connectivity completely? +

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

test_network_connectivity is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Ludus FastMCP tool call.

Deterministic rules across all 201 Ludus FastMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN LUDUS FASTMCP →

Free to start. No card required.

201 Ludus FastMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

test_network_connectivity

// WHAT TEST_NETWORK_CONNECTIVITY ON LUDUS FASTMCP DOES

// THE RISK

// HOW TO CONTROL TEST_NETWORK_CONNECTIVITY

// EXPLORE