I have traces from Bigflow and CAIDA dataset in a .pcap. I studied the FAQ
at tcpreplay website and remapped the IP addresses and MAC addresses as
well. I can also run the tcpreplay utility.

My problem is that I want to understand:

- Do I really need listening servers at the receiving end of traffic?
What's the difference with if I simply send UDP and ICMP without them? Will
it not be a simulation because the traffic still travels on wire to the
destination?-

- Am I right to remap the ip addresses to destination or do I need to keep
everything in .pcap unchanged?

It's a simulation of normal traffic to understand the traffic load in
topology and get statistics.
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