Question 1

How do I install udpreplay on Ubuntu?

Accepted Answer

First, install dependencies with 'sudo apt install cmake libpcap-dev g++', then navigate to the source, create a build directory, run CMake, and compile with make as detailed in the README. Finally, use 'sudo make install' for system-wide installation.

Question 2

Can udpreplay replay TCP packets?

Accepted Answer

No, udpreplay is designed exclusively for UDP packets, as stated in its description. For TCP replay, you'll need alternative tools like tcpreplay, which supports multiple protocols but with more complexity.

Question 3

udpreplay vs tcpreplay: which should I use?

Accepted Answer

Use udpreplay for lightweight, focused UDP replay with minimal setup; it's faster to deploy for UDP-specific tasks. Choose tcpreplay if you need multi-protocol support, advanced features, or are working with mixed traffic, though it has a steeper learning curve.

Question 4

How to adjust replay speed in udpreplay?

Accepted Answer

Use the '-s' option followed by a speed multiplier when running the command; for example, '-s 2' replays twice as fast relative to the original pcap timestamps, allowing flexible testing of network performance under different loads.

Question 5

Does udpreplay work with multicast UDP?

Accepted Answer

Yes, udpreplay supports replaying multicast UDP streams from pcap files, as mentioned in the key features and usage. This is useful for testing services like video streaming or discovery protocols that rely on multicast.

Question 6

What are the system requirements for building udpreplay?

Accepted Answer

It requires CMake 3.5 or higher, a C++ compiler like g++, and the libpcap-dev library, making it compatible with most Linux distributions such as Debian/Ubuntu and RHEL/CentOS, as specified in the building instructions.

udpreplay

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