session-replay-tools/tcpcopy
Tcpcopy
tcpcopy is a network traffic replication tool and mirroring system designed to capture live TCP streams and replay packet captures for performance and stress testing. It functions as a low-level packet capturer that filters data at the link layer to minimize loss while duplicating real-world traffic from production servers to test environments.
The tool distinguishes itself through TCP state machine simulation, which tracks sequence numbers and flags to modify packet headers and forge source identities. This allows the system to deceive target servers into accepting mirrored connections and simulated traffic patterns.
The project covers a broad range of traffic management capabilities, including live stream forwarding, packet replay from files, and the interception of response packets to isolate test traffic from production environments. These utilities support network environment validation and production load testing by replicating historical and real-time network interactions.
Features
- Live TCP Stream Mirroring - Mirrors active TCP streams from production interfaces to destination hosts for real-time load testing.
- TCP - Mirrors live TCP streams and replays PCAP files from production servers to test environments.
- Live TCP Replication - Forwards real-world TCP streams from a production server to a target server for stress and performance testing.
- Network Traffic Mirroring Systems - Captures and forwards network packets to replicate real-world traffic for performance and stress testing.
- Network Traffic Replay Tools - Replicates historical network interactions from captured PCAP files to validate system behavior.
- File-Based Replayers - Reads request packets from PCAP files to replicate network traffic on a target server for offline testing.
- TCP Traffic Replayers - Reads captured packet files and injects raw TCP sessions into the network stack to simulate historical traffic.
- Link Layer Captures - Captures and filters data at the link layer to minimize loss during high-traffic mirroring.
- Link Layer Filters - Captures and filters data at the link layer to minimize packet loss during high-traffic network mirroring.
- Packet Manipulation Toolkits - Implements real-time modification of source and destination IP addresses and ports to redirect traffic.
- TCP State Simulation - Simulates TCP state machine transitions, including sequence numbers and flags, to forge valid connections.
- Load Simulation Testing - Simulates high volumes of real-world requests to identify performance bottlenecks without impacting live users.
- Response Packet Interceptors - Captures response packets from a test service to prevent test traffic from impacting production environments.
- Response Interception Filters - Provides a mechanism to filter outbound response packets to prevent test traffic from leaking into production environments.
- TCP Interaction Simulators - Controls TCP interactions and network latency to ensure replicated traffic behaves realistically on target systems.
- Traffic-Based Environment Validation - Tests server stability and response times by duplicating actual user traffic in controlled staging areas.
- Infrastructure and Monitoring - Tool for replicating live traffic for stress testing and debugging.
Star history
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