Every header field under your control. Craft and transmit custom Ethernet frames — burst or continuous, fixed or random size — and watch throughput and errors live. Precision testing without the four-figure commercial license.
Source and destination MAC, EtherType, VLAN tags and every field of the Ethernet II header, exactly as you need.
TTL, ToS/DSCP, flags, protocol, source and destination IP — override any field for precise, repeatable tests.
Build transport-layer payloads for the three protocols that matter most in network validation and probing.
Send exact-length frames or randomize size across a range to emulate real-world mixed traffic.
Stream indefinitely or fire precise bursts at a target rate — ideal for throughput and stress testing.
Watch packets-per-second, throughput and error counts live as you transmit — no external analyzer needed.
Type payloads directly in hex for total byte-level control — craft malformed or edge-case frames on purpose.
Choose exactly which network interface transmits, so you always test on the right link.
Save configurations and reproduce the exact same test conditions every time — essential for regression testing.
Pick the exact adapter that will transmit your frames.
MAC, IP, protocol — set every field you need to control.
Fixed or random size, continuous or burst, at your target rate.
Hit transmit and watch throughput and errors in real time.
Send tagged frames with specific DSCP/ToS markings and verify your switches classify, remark and prioritize exactly as designed.
Craft the exact 5-tuple a rule should match — then the one it shouldn’t — and prove the policy behaves before an auditor asks.
Burst at line rate to find where a link saturates, when buffers overflow, and whether storm-control kicks in at the threshold.
Build undersized, oversized or deliberately wrong frames in the hex editor — the tests vendors hope you never run.
Click any screenshot to zoom.
Free for Windows — today, and always.
No license, no registration, no expiry.
| OS | Windows 10 / 11 (64-bit) |
| Layers | Ethernet II (L2), IPv4 (L3) |
| Transport | UDP, TCP, ICMP |
| Transmission | Continuous & burst · fixed or random size · configurable rate |
| Payload | Hex editor for full byte-level control |
| Monitoring | Real-time packets/sec, throughput & error counters |
| License | Free — no commercial license required |