tcpreplay and tcprelay are completely different network tools despite their similar names. tcpreplay edits and replays saved network traffic, while tcprelay forwards live traffic between connections. 🔄 Core Purpose
tcpreplay: Re-sends packets from a pre-recorded .pcap file onto a network.
tcprelay: Relays active TCP connections from one host/port to another. 🧪 Primary Use Cases
tcpreplay: Testing firewalls, Intrusion Detection Systems (IDS), and network performance.
tcprelay: Port forwarding, bypassing firewalls, and bridging networks (often in iOS jailbreaking). ⚙️ How They Operate
tcpreplay: Operates at Layer ⁄3, injecting raw packets directly into network interfaces.
tcprelay: Operates at Layer 4, managing live TCP streams and handshakes. ⚡ Directionality & Traffic Source
tcpreplay: Offline-to-online, unidirectional flow from a saved file to a target.
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