Hi,
I have an IP address I want to connect to. How can I tell what NIC Linux will use to make that connection on?
You look at your routing table to see which interface the kernel has been told to use to reach that IP address, then you see what NIC that interface is associated with in your setup.
One common way to display the routing table is the command "netstat -nr"; another is "route -n". The man pages for route and netstat will tell you more about options and switches.
The typical way to find out what actual device (in your case, what NIC) is associated with an interface is with the command "ifconfig -a". Some systems may not have that command (full-size distros usually do, but specialized distros like router/firewall systems may not), and you'll need to use some variant of "ip" instead, maybe "ip -s addr".
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