GNS3 can run appliance images and remote compute nodes, so lab isolation is critical.
- Keep lab bridges/NAT networks separated from production networks.
- Restrict remote compute server access to trusted admin hosts.
- Avoid importing untrusted appliance images without validation.
- Enforce authentication for GNS3 server/API.
- Use TLS for remote access channels where available.
- Limit host privileges of virtualization backends used by GNS3.