clarification on network configuration

[fastuco]

Hello everyone, I wanted to ask because during the network configuration if you assign IP address manually tells me that the network 'started successfully, but could not connect to the internet, but if i assign the IP address with DHCP internet connection is start properly.what you can 'do? If you assign an IP address manually, and then I go to test the network tells me that the IP address has not been confirmed, but it makes me log in with ftp