Thank you Grail, Thomas, and JJJCR,
Turns out it was an iptables issue. Iptables is allowing incoming communication to the Centos box but not outgoing communication (I don't think I even have a firewall on the Pi). I didn't state so on my original post, but I also have a server application being ran on both machines. The Pi client is able to access the server application on the Centos box using
./bin/bacrp 1234 1 0 85 which in turn is able to give a reply back (for some reason, this is allowed). But executing
./bin/bacrp 1234 1 0 85 on the Centos box gets blocked, so nothing is displayed.
Still trying to resolve it, and if you have any thoughts, please see
http://www.linuxquestions.org/questi...73#post5465173