Let's ask this question a little different. Why do you need two NIC's? At work we use three. One for the cluster link, and one for each of our two main switches, to provide some redundancy. At home I use two - one for my internal network, on for the internet - my NT server is set using DDNS and Proxy to allow my machines one shared IP and to allow me to setup a Web Server on DHCP using an auto host name.

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Death is lighter than a feather - duty heavier than a mountian.