I want to add second IP address to Mac computer with one net card?

Question

That is like advance in windows Network properties

Answer 1

1) Open System Preferences > Network

2) Under "Show" Pull-down, select "Network Port Configurations"

3) Click "New"

4) Select "Built-in Ethernet" port, enter a name, and click "OK"

5) Under "Show" Pull-down, select your new port

6) Apply your secondary interface settings

... or in Terminal, run the following command:

sudo ifconfig en0 inet 192.168.2.1 netmask 255.255.255.0 alias