tcpdump is a command line tool to capture network traffic on an interface. To run it as a regular user requires enabling some extra capabilities.
sudo yum install tcpdump libcap
Then you grant the tcpdump binary the following caps:
sudo setcap cap_net_raw,cap_net_admin+ep /usr/sbin/tcpdump
Now a regular user can use tcpdump with:
tcpdump -i eno8303 -n -A "port 1234" -w ./Capture.pcap
This is a bit dangerous so to turn of the capabilities later:
sudo setcap -r /usr/sbin/tcpdump