gns3-mcp 0.46.1

GNS3 lab automation MCP server with AI agent integration

GNS3 MCP Server

Model Context Protocol (MCP) server for GNS3 network lab automation. Control GNS3 projects, nodes, and device consoles through Claude Desktop or any MCP-compatible client.

Version: 0.46.0

Features

• 32 Tools: Complete GNS3 lab automation + resource query tools for Claude Desktop
• 25 Resources: Read-only data access (projects, nodes, links, sessions, topology reports)
• Project Management: Create, open, close GNS3 projects
• Node Control: Start/stop/restart nodes with wildcard patterns (*, Router*)
• Console Access: Telnet console automation with pattern matching and grep filtering
• SSH Automation: Network device automation via Netmiko (200+ device types)
• Network Topology: Batch connect/disconnect links, create drawings, export diagrams
• Docker Integration: Configure container networks, read/write files
• Claude Desktop Support: All resources accessible via tools (query_resource, list_projects, list_nodes, get_topology)
• Security: API key authentication (HTTP mode), service privilege isolation, HTTPS support

Installation

Supported Platform: Windows only

Quick Start (Claude Code - Recommended)

Prerequisites:

• Windows 10/11
• GNS3 server running and accessible
• Claude Code installed
• uv package manager (for uvx): Install with pip install uv or download from https://github.com/astral-sh/uv

Option 1: Using uvx (Recommended - Faster)

# Step 1: Configure GNS3 credentials
@"
GNS3_HOST=192.168.1.20
GNS3_PORT=80
GNS3_USER=admin
GNS3_PASSWORD=your-password
"@ | Out-File -FilePath .env -Encoding ASCII

# Step 2: Install and add to Claude Code (uvx auto-installs package)
claude mcp add --transport stdio gns3-lab -- uvx gns3-mcp@latest

# Step 3: Verify installation
claude mcp get gns3-lab
# Should show: Status: ✓ Connected

Option 2: Using pip (Traditional)

# Step 1: Install package
pip install gns3-mcp

# Step 2: Configure GNS3 credentials
@"
GNS3_HOST=192.168.1.20
GNS3_PORT=80
GNS3_USER=admin
GNS3_PASSWORD=your-password
"@ | Out-File -FilePath .env -Encoding ASCII

# Step 3: Add to Claude Code
claude mcp add --transport stdio gns3-lab -- gns3-mcp

# Step 4: Verify installation
claude mcp get gns3-lab
# Should show: Status: ✓ Connected

Why uvx? 10-100× faster than pip, automatic dependency isolation, no venv management needed.

---

Installation by Editor

Claude Code (Detailed Setup)

Claude Code Setup

STDIO Mode (Recommended)

STDIO mode is more secure - no HTTP service, no authentication needed, runs only when Claude Code is active.

Using uvx (Recommended):

# 1. Install uv (one-time setup)
pip install uv

# 2. Create .env file
@"
GNS3_HOST=192.168.1.20
GNS3_PORT=80
GNS3_USER=admin
GNS3_PASSWORD=your-password
"@ | Out-File -FilePath .env -Encoding ASCII

# 3. Add to Claude Code
claude mcp add --transport stdio gns3-lab -- uvx gns3-mcp@latest

# 4. Verify
claude mcp get gns3-lab

Using pip:

# 1. Install package globally
pip install gns3-mcp

# 2. Create .env file in project directory
@"
GNS3_HOST=192.168.1.20
GNS3_PORT=80
GNS3_USER=admin
GNS3_PASSWORD=your-password
"@ | Out-File -FilePath .env -Encoding ASCII

# 3. Add to Claude Code
claude mcp add --transport stdio gns3-lab -- gns3-mcp

# 4. Verify
claude mcp get gns3-lab
# Should show: Status: ✓ Connected

Environment Variables:

Variable	Required	Description	Example
GNS3_HOST	Yes	GNS3 server IP/hostname	192.168.1.20
GNS3_PORT	Yes	GNS3 server port	80 or 3080
GNS3_USER	Yes	GNS3 username	admin
GNS3_PASSWORD	Yes	GNS3 password	your-password

Claude Desktop (.mcpb Package)

Claude Desktop Setup

Installation:

1. Download the latest .mcpb package:

   • From Releases
   • Or build locally: just build (creates mcp-server\mcp-server.mcpb)

2. Install by double-clicking the .mcpb file

3. Configure credentials in Claude Desktop:

   • Open Claude Desktop
   • Go to Settings > Developer > Edit Config
   • Find gns3-mcp server
   • Add environment variables:

     {
       "GNS3_HOST": "192.168.1.20",
       "GNS3_PORT": "80",
       "GNS3_USER": "admin",
       "GNS3_PASSWORD": "your-password"
     }
     

4. Restart Claude Desktop

5. Check logs if issues occur:

   C:\Users\<username>\AppData\Roaming\Claude\logs\mcp-server-GNS3 Lab Controller.log
   

Cursor & Windsurf (JSON Configuration)

Cursor Setup

Configuration File Location:

• Project-specific: .cursor\mcp.json (in project directory)
• Global: %USERPROFILE%\.cursor\mcp.json

Using uvx (Recommended):

1. Install uv: pip install uv

2. Create/edit .cursor\mcp.json:

{
  "mcpServers": {
    "gns3-lab": {
      "command": "uvx",
      "args": ["gns3-mcp@latest"],
      "env": {
        "GNS3_HOST": "192.168.1.20",
        "GNS3_PORT": "80",
        "GNS3_USER": "admin",
        "GNS3_PASSWORD": "your-password"
      }
    }
  }
}

Using pip:

1. Install package: pip install gns3-mcp

2. Create/edit .cursor\mcp.json:

{
  "mcpServers": {
    "gns3-lab": {
      "command": "gns3-mcp",
      "args": [],
      "env": {
        "GNS3_HOST": "192.168.1.20",
        "GNS3_PORT": "80",
        "GNS3_USER": "admin",
        "GNS3_PASSWORD": "your-password"
      }
    }
  }
}

3. Restart Cursor

---

Windsurf Setup

Configuration File Location: %USERPROFILE%\.codeium\windsurf\mcp_config.json

Using uvx (Recommended):

1. Install uv: pip install uv

2. Create/edit mcp_config.json:

{
  "mcpServers": {
    "gns3-lab": {
      "command": "uvx",
      "args": ["gns3-mcp@latest"],
      "env": {
        "GNS3_HOST": "192.168.1.20",
        "GNS3_PORT": "80",
        "GNS3_USER": "admin",
        "GNS3_PASSWORD": "your-password"
      }
    }
  }
}

Using pip:

1. Install package: pip install gns3-mcp

2. Create/edit mcp_config.json:

{
  "mcpServers": {
    "gns3-lab": {
      "command": "gns3-mcp",
      "args": [],
      "env": {
        "GNS3_HOST": "192.168.1.20",
        "GNS3_PORT": "80",
        "GNS3_USER": "admin",
        "GNS3_PASSWORD": "your-password"
      }
    }
  }
}

3. Restart Windsurf

Note: Cursor and Windsurf use identical configuration formats.

---

Troubleshooting

Connection Issues:

# Test GNS3 server connectivity
curl http://192.168.1.20:80/v3/projects

# Check Claude Code MCP status
claude mcp get gns3-lab

# View detailed logs (Claude Code)
# Check console output when running commands

Common Issues:

• "gns3-mcp not found": Ensure package is installed (pip list | findstr gns3-mcp)
• "Connection refused": Verify GNS3 server is running and accessible
• "Authentication failed": Check credentials in .env file
• "Socket is closed": SSH session expired, reconnect automatically on next command

For Claude Desktop issues: Check logs at:

C:\Users\<username>\AppData\Roaming\Claude\logs\mcp-server-GNS3 Lab Controller.log

---

Advanced Setup

HTTP Mode (Always-Running Service)

HTTP Mode Configuration

HTTP mode requires a persistent service and API key authentication. Only use if you need the service always running or network access from other machines.

Prerequisites:

• .env file with GNS3 credentials
• API key for authentication

Setup:

1. Add to .env:

   # Generate with: python -c "import secrets; print(secrets.token_urlsafe(32))"
   MCP_API_KEY=your-random-token-here
   

2. Configure Claude Code:

   claude mcp add --transport http gns3-lab `
     http://127.0.0.1:8100/mcp/ `
     --header "MCP_API_KEY: your-random-token-here"
   

3. Start server (in separate terminal):

   gns3-mcp --transport http --http-port 8100
   

Note: If MCP_API_KEY is missing from .env, it will be auto-generated on first start and automatically saved to .env for persistence.

Windows Service (Production Deployment)

Windows Service Deployment

Run MCP server as a Windows service with WinSW (for HTTP mode):

Setup (one-time):

# 1. Recreate venv with all dependencies (including FastAPI)
.\server.cmd venv-recreate

# 2. Create service user account (requires Administrator)
.\server.cmd create-user

# 3. Install and start service
.\server.cmd install

Service Management:

# Check status
.\server.cmd status

# Start/stop/restart
.\server.cmd start
.\server.cmd stop
.\server.cmd restart

# After code updates
.\server.cmd venv-recreate    # Rebuild dependencies
.\server.cmd reinstall        # Reinstall service

# Remove service
.\server.cmd uninstall

Service Details:

• User: GNS3MCPService (low privilege, not LocalSystem)
• Startup: Automatic
• Logs: mcp-http-server.log and GNS3-MCP-HTTP.wrapper.log
• Commands: All integrated into server.cmd

Development Setup (Contributors)

Manual Installation from Source

Requirements:

• Python ≥ 3.10
• GNS3 Server v3.x running and accessible

Setup:

# Install dependencies
pip install -r requirements.txt

# Create .env file
@"
GNS3_HOST=192.168.1.20
GNS3_PORT=80
GNS3_USER=admin
GNS3_PASSWORD=your-password
"@ | Out-File -FilePath .env -Encoding ASCII

# Run directly (STDIO mode - no authentication)
python gns3_mcp\cli.py --host 192.168.1.20 --port 80 --username admin --password your-password

# Or add to Claude Code (project-scoped)
claude mcp add --transport stdio gns3-lab --scope project -- python "C:\full\path\to\gns3_mcp\cli.py"

Build .mcpb package:

just build
# Creates: mcp-server\mcp-server.mcpb

Documentation

• CHANGELOG.md - Version history and release notes
• DEPLOYMENT.md - SSH proxy deployment instructions
• docs/architecture/ - Architecture documentation and C4 diagrams

License

MIT License

Author

Sergei Chistokhin ([e-mail])