zoonderkins/check incoming and outgoing udp traffic.md

## check incoming and outgoing udp traffic.md

      
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              check incoming and outgoing udp traffic.md
            
          
    Check incoming and outgoing UDP traffic

# Outgoing
nc -v -u www.google.com 443

# Incoming
nc -v -u 1.1.1.1 443

Verify with TCPDUMP

Sometimes that nc -vu command is not enough to verify UDP 443 port unless it will return some information back You can verify it with tcpdump, e.g. Run tcpdump on the website's server.
tcpdump -vv udp port 443 -X
Run nc command from any client server.
nc -vu YOUR_DOMAIN 443
and you should see some output on server if there's any UDP port 443 traffic in and out.