How to detect Application Layer Protocol

Tags:
Linux
Networking
Proxy Firewall
I have redirected web, SSH, FTP to port 5000 where my server is listening for both TCP and UDP with the help of IPTables. Now I need to know the real destination port the traffic so that I could guess application layer protocol on the basis of original destination port. Or Is there another way to detect application layer protocol from redirected packages?


Software/Hardware used:
IPTables, Conntrack
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