Network = Insert the network address of the CryptoBox server, the network mask and the default gateway. Be aware that you may lose your connection to the server under some circumstances. The actual values are visible in the form fields.
DHCP = If you enable automatic network configuration make sure you have a well configured DHCP server running. All values will be overridden by the settings from the DHCP server. If you don't know what DHCP means leave this box unchecked.