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how to identify the VMs of traffic capture

I have two VMs and network configuration below :

VM1(192.168.1.10,client) -------------------- VM2 ( 192.168.1.20,also a web server ,listening on tcp port 80)

running the command of traffic capture from VM1:

VM1: tcpdump -i eth0 host 192.168.1.20 -w /tmp/traffic.pcap

then, VM1: curl 192.168.1.20

then we stop the traffic capture from both VMs , Since we know that this traffic capture from VM1, but what if we just share this file with someone who doesn't know where does the traffic capture from , is there any way for someone who has no idea about where the traffic capture from to identify where the traffic capture from ? thanks