add_dhcp_reservation

THE RISK

Medium Risk

Why add_dhcp_reservation needs a policy

This tool creates or modifies DHCP lease reservations, which are persistent network configurations. While reversible (can be removed), it affects network connectivity and device addressing. Classified as Write rather than Execute because it modifies network data/configuration rather than executing arbitrary commands.

From the tool's definition Tool reserves/assigns IP addresses via DHCP, modifying network configuration persistently. Description states 'Reserve IP address for specific MAC address (static DHCP lease)' - creates or modifies network state.

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

POLICY

How to control add_dhcp_reservation

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

policy.json

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

add_dhcp_reservation 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.

Create a free account and register ASUS Merlin Router 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.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

More ASUS Merlin Router MCP Server tools

Destructive remove_dhcp_reservation Remove DHCP reservation by MAC or IP address Destructive remove_keyword_filter Remove keyword from filter list Destructive remove_mac_filter Remove device from MAC filter Destructive remove_network_service_filter_rule Remove network service filter rule by matching all criteria exactly Destructive remove_url_filter Remove URL pattern from global filter list Destructive remove_vpn_routing_policy Remove device from VPN Director routing (Asuswrt-Merlin firmware only). Device will return Execute execute_command Execute a custom command on the router via SSH. WARNING: NEVER use this for file operation Execute restart_service Restart a specific router service (e.g., wireless, vpnclient1, httpd)

All 47 ASUS Merlin Router MCP Server tools →

Write tools on other servers

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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 add_dhcp_reservation

What does the add_dhcp_reservation tool do? +

Reserve IP address for specific MAC address (static DHCP lease). It is categorised as a Write tool in the ASUS Merlin Router 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 add_dhcp_reservation? +

Register the ASUS Merlin Router MCP Server MCP server in PolicyLayer and add a rule for add_dhcp_reservation: 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 ASUS Merlin Router MCP Server. Nothing to install.

What risk level is add_dhcp_reservation? +

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

Can I rate-limit add_dhcp_reservation? +

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

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

add_dhcp_reservation is provided by the ASUS Merlin Router MCP Server MCP server (kcsoukup/asus-merlin-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every ASUS Merlin Router MCP Server tool call.

Start from ASUS Merlin Router 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 →