Networking: Configuration, Troubleshooting, and Optimization

Configure, troubleshoot, and optimize Linux networking infrastructure. Covers DNS, reverse proxies, VPNs, firewalls (nftables), VLANs, subnetting, high availability, dynamic routing, and network performance tuning.

Target versions: see references/versions.md (verified per the receipt date in that file). Do not restate version numbers here.

When to use