Hello All, I have observed that fping (v4.0) discards all ICMP reply if the delay is greater than per host sending interval (set using -p). flent uses fping with per host interval as 0.2 (200 ms), which is very low if netserver is far from flent client (Example RTT > 200 ms). In such case flent will not be able to generate ping results. Same problem occurs when we setup a test bed and add extra delay using netem between flent client and netserver. I think flent should handle this scenario. Thanks and Regards, Sourabh Jain