OpenVPN vs tcpflow

OpenVPN

Security & Privacy

OpenVPN is an open-source software application that implements virtual private network (VPN) techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses a custom security protocol that utilizes SSL/TLS for key exchange. It is capable of traversing network address translation (NAT) and firewalls.

tcpflow

Network & Admin

tcpflow is an open source tool for capturing TCP traffic flows. It works by capturing packets from network interfaces or packet capture files, reassembling TCP streams, and storing application-layer data with relevant TCP metadata.