I have an application that listen on udp port 1234. I already added the udp/1234 in my firewall and checked if the port is already added to the allowed ports. When I checked if the port is listening using netstat, the port is using udp6 instead of udp. Is there a way to change this to udp instead of udp6. please see image for reference. My Application is running in CentOS 7.