Add network service filter rule to block/allow specific services by IP and port. Deny list blocks services during schedule. Allow list only allows services during schedule. Leave source IP blank to apply to all devices.
AI agents use add_network_service_filter_rule to create or update resources in ASUS Merlin Router MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ASUS Merlin Router MCP Server environment.
This tool creates or modifies firewall rules and network access policies, which are reversible configuration changes (Write category). Severity is high because misconfiguration could block critical services, disrupt network connectivity for all devices, or create security vulnerabilities. The ability to apply rules to 'all devices' and selectively block/allow services increases blast radius.
From the tool's definition 'Add network service filter rule' with capabilities to 'block/allow specific services by IP and port' and 'apply to all devices' - creates filter rules that modify router firewall configuration and network access policies
Documented attack patterns abuse exactly the kind of access add_network_service_filter_rule gives an agent:
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_network_service_filter_rule:
{
"version": "1",
"default": "deny",
"tools": {
"add_network_service_filter_rule": {
"limits": [
{
"counter": "add_network_service_filter_rule_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_network_service_filter_rule 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.
Free to start. No card required.
Add network service filter rule to block/allow specific services by IP and port. Deny list blocks services during schedule. Allow list only allows services during schedule. Leave source IP blank to apply to all devices. 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.
Register the ASUS Merlin Router MCP Server MCP server in PolicyLayer and add a rule for add_network_service_filter_rule: 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.
add_network_service_filter_rule is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add_network_service_filter_rule 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.
Set action: deny in the PolicyLayer policy for add_network_service_filter_rule. 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.
add_network_service_filter_rule 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.
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.
Free to start. No card required.
47 ASUS Merlin Router MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.