UDP multicast client does not see UDP multicast traffic generated by tcpreplay

Question

I have two programs:

• server ... it generates UDP traffic on a chosen multicast
• listener ... it prints UDP traffic on a chosen multicast (it sub

Answer 1

In my case I needed to adjust the pcap file by setting the correct destination MAC address. Also the checksum should be recalculated. And yes, 2 hosts are required for "tcpreplay". Without these I was fighting for a long time but only "tcpdump" showed the replayed stream, not my multicast listening app :(

Here is the link to my article: Step by step instructions on Dump/Replay Multicast feed