Pinging shows unknown host

[Vriz]

Hi,

I'm connecting to a network with the domain name test.com. My PCs with the windows OS (hostname is pc1 and pc2) could ping each other with their hostname or hostname with domain name. I installed Redhat 7.2 on another system and change the hostname to pc3 by modifying the /etc/hosts and /etc/sysconfig/network files and restarting the PC (another other elegant way to change the hostname using a system command? did I miss out any other files?).
pc3 could ping pc1 and pc2, but pc1 and pc2 couldn't ping pc3, and shows the unknown host msg. When I type domainname in pc3, it shows none. Therefore, I run domainname test.com on pc3 to set the domainname (is this necessary? I believe so. What files are changed by this command?). I still couldn't ping pc3 from my windows or other linux systems. Could someone help me with this? Thank you.


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