Hello, We can see # lspci 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01) I have used a custom kernel to start with centos 5.1 as an initial installation Our customer on this kernel has experienced slow pref on samba shares (50 seconds to open a file) So I have decided to updrade to centos 5.2 that have the right detection of this card inside (2.6.18-92.1.6.el5.centos.plus) [<http://wiki.centos.org/AdditionalResources/HardwareList/CentOS5/RealTek/r1 000?action=show&redirect=HardwareList%2FCentOS5%2FRealTek%2Fr1000>] # yum update # reboot The slow samba shares didn't disapear at all ! I have corrected the trouble by doing this : # cd /usr/src/ # curl -O ftp://218.210.127.132/cn/nic/r8101-1.007.00.tar.bz2 # tar jxvf r8101-1.007.00.tar.bz2 # cd r8101-1.007.00 # make clean modules # make install # depmod -a # insmod ./src/r8101.ko # reboot After the reboot we can see that the r8101 module has been activated # dmesg | egrep -i r[0-9]{4} Finaly the slow samba share was gone ! (on 10 servers) Cordialement Emmanuel Borlet Service développement RFI Informatique Groupe Yoni 8 & 12 avenue Pierre-de-Coubertin ZI Percevalière 38170 Seyssinet-Pariset France http://www.rfi-informatique.fr/ http://www.phebux.net/ Tél : +33 (0)4 76 84 25 84 Fax : +33 (0)4 76 84 25 85