What port should I add to firewall to allow ping from client?
My server is using Centos as its operating system, and my client is using Windows Xp. I set a FQDN to my server IP address, then I set my client dns server to my server IP address. If my server firewall is disabled, I can ping FQDN from my client command prompt, but when my server firewall was enabled, I can't. I want my server firewall to be enabled, but I can ping from my client, too. What port should I add to my server firewall? or what should I do? Please help me.