Wan on eth1 and Lan on eth0

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http://www.unix.com – I have a local network on dev eth0 Server has static IP of Gateway is and Dns is I am using this network for imaging 500 plus computer... Now, Issue that I am having is that I need to update packages and I dont want to change the configuration on eth0 because I dont want something breaking out on my imaging system... the server has two nics and I want to use eth1 to connect to the internet, the only issues is, I got no clue how to do it without messing my network which I need it to do my daily job... OS CentOS 6.3 (HowTos)