Network Traffic Replay Systems are used to capture real-life traffic from a network and replay it later with the exact same timing for testing using real-world traffic.
Traffic Replay Systems are typically used for debugging of real-life network problems in a controlled environment.
When the Napatech Network Adapters are used for Network Traffic Replay, the adapter line speed packet capture and time stamp functionality is used to capture the data to be replayed. The captured data includes information about the frame timing on the network. This can be used when the traffic is replayed in order to ensure that the replayed traffic has the same frame timing as the captured traffic.
Network Traffic Replay Applications are supported by the Napatech Network Adapters via functionality, such as:
- High-precision Time-stamping: Captured frames are time-stamped, enabling the retrieval of exact timing of the captured frames.
- Line Speed Capture: All frames can be captured on any network load condition so that the full network story can be replayed.
- Programmable Filtering: Adapter filters can be set up so that only relevant frames, e.g. VoIP frames, are captured.
- Host-based Transmit: Enables frames to be transmitted to the network with a minimum of host CPU processing. The Napatech host-based transmit functionality enables line speed transmit on any network connection up to 25 Gbps.
- Replay of MAC CRC: The adapter can be configured to transmit the captured frames with the Ethernet MAC CRC from the captured frames.
- Programmable IFG: The Inter Frame Gap (the time delay between Ethernet frames) can be configured, either as a global parameter used by all transmitted frames or individually for each transmitted frame with a typical precision below 40 us.