hello list here is the setup: a domain controller with ldap backend. os is debian testing with custom 2.6.9 kernel samba version 3.0.10-1 openldap version 2.1.30-3 local profiles only clients are mainly nt4 sp6, some win xp pro approximately 30 win users + 1 or 2 diskless linux station for testing purpose (ltsp ). 16 directories shared by server, including homedirs, with acl support ( 20GO og data ) here is the setup: users experience network slowdown at the end of the work day ( slow transfer, slow win epxlorer operations ... ). cpu and net load on server side is insignifiant ( it is an oversized dual p4 w/ giga ethernet and 4 Gig of ram ). i dont even know if the problem is related to samba, i am just expecting some idea as to where/what to look at. relevant portion of smb.conf: netbios name = server server string = controleur du domaine workgroup = gr_travail domain logons = true domain master = true os level = 35 prefered master = yes encrypt passwords = true socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192 interfaces = 127.0.0.1 192.168.1.2 passdb backend = ldapsam ldap ssl = No ldap admin dn = cn=admin,dc=gr_travail ldap suffix = dc=rgr_travail ldap machine suffix = ou=machines ldap user suffix = ou=utilisateurs ldap group suffix = ou=groupes log file = /var/log/samba/samba.log log level = 0 load printers = yes printing = cups printcap name = cups dos charset = cp850 unix charset = iso8859-1 relevant portions of slapd.conf: backend bdb database bdb checkpoint 1 5 cachesize 100000 idletimeout 20 index objectClass,uid,uidNumber,gidNumber,memberUid eq index cn,mail,surname,givenname eq,subinitial thanks for your patience and your aswers -- Thomas Constans http://www.opendoor.fr 04 78 68 17 34