On 14/08/16 12:20, Anand Buddhdev wrote: Hi folks, I've discovered something. See below: > The packet rate is also not that high. From the sending side, this is > what I have: > > # tcpreplay -i qtx:p1p1 5min.pcap If I send packets without qtx, like this: tcpreplay -i p1p1 5min.pcap then tcpdump on the receiving box has no problem, and keeps up happily with the queries, and receives all of them into the pcap file. It seems like the qtx module is somehow interfering with the packet capture, but I don't know how or why yet. Anyway, for low packet rates, such as 20,000 q/s, qtx isn't necessary, so I will not use it when I want to do packet captures. Regards, Anand