automateyournetwork/gns3-packet-capture
workspace/skills/gns3-packet-capture/SKILL.md
Capture network traffic on GNS3 links - start/stop captures, retrieve PCAP data
$ install --global
skillsauthnpx skillsauth add automateyournetwork/netclaw gns3-packet-captureInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
95%
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SemgrepStatic code analysis for vulnerabilities
95%
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mcp-scan (Snyk)Model Context Protocol security validation
95%
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OWASP Dep-Check
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Last scanned: Apr 20, 2026, 3:29 AM5.1s1 file scanned
SKILL.md
- name:
- gns3-packet-capture
- description:
- Capture network traffic on GNS3 links - start/stop captures, retrieve PCAP data
- license:
- Apache-2.0
- user-invocable:
- true
- bins:
- ["python3"]
- env:
- ["GNS3_URL", "GNS3_USER", "GNS3_PASSWORD"]
GNS3 Packet Capture
Start and stop packet captures on links in GNS3 projects. Capture network traffic for analysis and troubleshooting.
When to Use
- Troubleshooting network connectivity issues in a lab
- Capturing traffic for analysis with Wireshark
- Verifying routing protocol exchanges (OSPF, BGP, etc.)
- Debugging application traffic
- Learning about network protocols
- Validating QoS or security policies
MCP Server
- Command:
python3 -u mcp-servers/gns3-mcp-server/gns3_mcp_server.py(stdio transport) - Requires:
GNS3_URL,GNS3_USER,GNS3_PASSWORDenvironment variables
Available Tools
| Tool | Parameters | What It Does |
|------|------------|--------------|
| gns3_start_capture | project_id, link_id, capture_file_name? | Start packet capture on a link |
| gns3_stop_capture | project_id, link_id | Stop packet capture and finalize PCAP file |
| gns3_get_capture | project_id, link_id | Get capture file path and stream URL |
Workflow Examples
Capture Traffic for Analysis
# First, identify the link to capture
"List all links in routing-test"
# Start capture on the link between router1 and router2
"Start capturing traffic on link abc123 in routing-test"
# Generate some traffic (ping, routing updates, etc.)
# ...
# Stop capture when done
"Stop the capture on link abc123 in routing-test"
# Get the PCAP file location
"Get capture info for link abc123 in routing-test"
Custom Capture Filename
# Start capture with custom filename
"Start capturing on link abc123 in routing-test as ospf_adjacency.pcap"
Live Streaming
# Get stream URL for live capture viewing
"Get capture info for link abc123 in routing-test"
# Returns stream_url for live PCAP streaming
Integration with Other Skills
- gns3-link-management: List links to find the one to capture
- gns3-node-operations: Ensure nodes are running before capturing
- packet-analysis: Hand off PCAP data for deep inspection
Capture Output
- PCAP Format: Standard libpcap format compatible with Wireshark
- File Location: Stored on GNS3 server, path returned in response
- Stream URL: Available for live capture viewing when capture is active
Error Handling
| Error Code | Meaning | Resolution | |------------|---------|------------| | GNS3_NOT_FOUND | Link doesn't exist | Use gns3_list_links to find valid link IDs | | GNS3_CONFLICT | Capture already running | Stop existing capture first |
Tips
- Find the right link: Use
gns3_list_linksto see all connections and their IDs - Start before traffic: Begin capture before generating the traffic you want to analyze
- Stop cleanly: Always stop capture to finalize the PCAP file
- Use custom names: Descriptive filenames help organize multiple captures
Notes
- Captures are stored on the GNS3 server
- Link IDs are UUIDs from
gns3_list_links - Only one capture per link at a time
- Stop capture to ensure PCAP file is complete
- All operations logged to GAIT audit trail
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