need help in adding second NIC

Greetings.

When I Debian Linux, it gave me an option of eth0 or eth1, so I know it could see both NICs ... I chose to use eth0 for my internal network, using 192.168.100.43 ...now need to use the second NIC for an external IP of 66.162.xxx.248 .... I've modified /etc/network/interfaces as shown below, but of course, it still doesn't work ... what else do I need to do?

Thanks in advance for the help.

here's /etc/network/interfaces:


auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.100.43
        netmask 255.255.255.0
        network 192.168.100.0
        broadcast 192.168.100.255
        gateway 192.168.100.42
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 206.124.64.253 206.124.65.253
        dns-search usseryprinting.com

auto eth1
iface eth1 inet static
        address 66.162.xxx.248
        netmask 255.255.255.0