NIS - Network Information Service
- Local, distributed database
- not design as secure system
- NIS maps: hosts, passwd, group, ethers, netmasks, protocols, netgroups, services
- ypwhich; ypcat hosts
- yppasswd - disabled
- normal users should not have access to ‘ypcat’:can use ‘ypcat’ to list all usernames, hosts
- one master server, several secondary servers
- medialab (162), brickyard (117), kopernik (117), newton (162), sandman (162), timberland (14), osprey.loc (164), outback (144), clyde (144), acrux (7), pecan (7), mordillo (117)
- NIS+ is completely rewritten (very complex)