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I have a server with two NIC cards. Right now eth0 is connected to my router to my ISP. But i want to setup eth1 as my LAN so deliver an internet connection from the server to my laptop.

How can i setup my eth1 as a LAN while my eth0 is a WAN.

I am running CENTOS 6.4 terminal.

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echo 1 > /proc/sys/net/ipv4/ip_forwarding

will enable IP forwarding. You need to put this in a startup script for it to persist after boot. You can also set this kernel setting in sysctl.conf (wherever it is on CentOS).

You also need to look into iptables to set up some basic security, as well as NAT if you need it.

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