Pages/Optimizing Performance on Gigabit Networks.md ..
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## Understanding the Flow of Packets
Understanding how packets flow from the `iperf` client via the OpenVPN tunnel to the `iperf` server is crucial. The following diagram helps to clarify this process:
When an `iperf` packet is sent to the VPN server IP address, it enters the kernel's `tun0` device. The packet is then forwarded to the userspace OpenVPN process, where headers are stripped. The packet is encrypted and signed using OpenSSL calls, configurable via the `--cipher` and `--auth` options.
