The netmask is used to determine which machines are local to your network.  Consult your network administrator if you do not know the value.  The netmask should be entered as four numbers separated by periods.
Tagelmust n uzeṭṭa tettuseqdac i uguccel n tmacinin i yellan deg uzeṭṭa-inek·inem.  Wali akked unedbal-inek·inem n uzeṭṭa ma yella ur tessineḍ ara azal.  Tagelmust n uzeṭṭa ilaq ad tettusekcem d ukkuẓ n yimḍanen ferqen s wagazen.