# ktutil
ktutil: add_entry -password -p dhcpduser@DOMENA.LAN -k 2 -f
ktutil: add_entry -password -p dhcpduser@DOMENA.LAN -k 3 -f
ktutil: wkt /etc/dhcp/dhcpduser.keytab
ktutil: quit

# file /etc/dhcp/dhcpduser.keytab
dhcpduser.keytab: Kerberos Keytab file, realm=DOMENA.LAN, principal=dhcpduser/, type=91432, date=Tue Aug 17 16:02:08 1993, kvno=23

# chmod 0400 /etc/dhcp/dhcpduser.keytab