libnss-ldap - 265-5 main

This package provides a Name Service Switch that allows your LDAP server
act as a name service. This means providing user account information,
group id's, host information, aliases, netgroups, and basically anything
else that you would normally get from /etc flat files or NIS.
.
If used with glibc 2.1's nscd (Name Service Cache Daemon) it will help
reduce your network traffic and speed up lookups for entries.