Problems pinging network addresses in Li

I am running Red Hat Linux 7.3. I have two network cards installed and configured as follows:

10/100 – 200.200.200.111 (eth0)
10/100/1000 – 200.200.200.112 (eth1)

My problem is that when I try to ping a network address, it says host unreachable because by default the Linux box is using eth1. How can I make eth0 the default network card for data communication, especially ping?