I have NXLOG installed, and use UDP to receive and sent the servers logs. However, when I run the netstat command I found that there are packets on error and other received through unknown ports. See the lines shown :
123234944 packets received
223432 packets to unknown port received.
523455 packet receive errors
2111 packets sent
Why does it happen? I didn't configure any other port on my NXLOG and the firewall rules only accept 514 port to communicate with my NXLOG server.
How could I verify what is this? Is it normal?
Thank you very much for your help and answer