Create firewall rules for inter-VLAN routing
AI agents use routing_create_intervlan_rules to create or update resources in OPNSense MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your OPNSense MCP Server environment.
This tool creates firewall rules, which are configuration changes that can be modified or deleted later (reversible), placing it in the Write category rather than Destructive. The severity is high because misconfigured inter-VLAN routing rules could expose network segments, disrupt traffic between VLANs, or create unintended access paths—significant security implications even though the action is not irreversible.
From the tool's definition Tool name 'routing_create_intervlan_rules' and description 'Create firewall rules for inter-VLAN routing' indicate creation of firewall configuration rules.
Documented attack patterns abuse exactly the kind of access routing_create_intervlan_rules gives an agent:
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 routing_create_intervlan_rules:
{
"version": "1",
"default": "deny",
"tools": {
"routing_create_intervlan_rules": {
"limits": [
{
"counter": "routing_create_intervlan_rules_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}routing_create_intervlan_rules 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.
Create firewall rules for inter-VLAN routing. 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.
Register the OPNSense MCP Server MCP server in PolicyLayer and add a rule for routing_create_intervlan_rules: 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.
routing_create_intervlan_rules 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 routing_create_intervlan_rules 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 routing_create_intervlan_rules. 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.
routing_create_intervlan_rules is provided by the OPNSense MCP Server MCP server (vespo92/opnsensemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 196 OPNSense MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
196 OPNSense MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.