Network connections are managed by NetworkManager in Salix. It is an open source wired and wireless network manager for Linux which aims to provide a simple interface to connect to networks with a wide variety of settings. You will find NetworkManager in your system tray.
It will connect to wired (Ethernet only, no PPPoE/DSL support yet) and wireless networks.
Note that networkmanager must be activated in the system services in order to use it..