netcfg This package is used by debian-installer to configure the network. The purpose is two-fold: 1. configure the network for the currently running kernel so that the base system can be retrieved from the internet or a local mirror. 2. write configuration files so that when the machine reboots into the full debian system the network is brought up automatically. netcfg is written specifically for the debian-installer and probably won't work as expected if you try to run it on a full Debian system. If you want something for a full system, take a look at etherconf or pppconfig (eventually). Currently static and dhcp configuration is supported.