VIA VT86C100A LAN Combo Driver 100a

Read the information in your manual or on the product web site to find out if you have an onboard ethernet solution. Network connectivity can be available through an onboard ethernet controller or an ethernet/NIC card. If you have a separate ethernet/NIC/network card, you need to obtain the drivers from the manufacturer of the card - even if the chip on the card is manufactured by VIA.
The VT8231 and VT8233 southbridges, may be supplied with an integrated ethernet solution. To be sure, check the motherboard manual or the specifications of the mainboard on the manufacturers web site. Other mainboards might have what is often referred to as a companion chip. That is an ethernet chip which is separate to the South Bridge.
For Windows 9X/2K/ME/NT/XP/Unixware/FreeBSD/Linux/Lan Server DOS/LANTASTIC. The current driver package supports linux kernel versions 2.2.x and 2.4.x