On Fri, May 04, 2012 at 01:38:30PM +0200, Rafał Radecki wrote: > I have random network connectivity problems only reboot helps for some > time, then the problem returns. > > I've added irqpoll option to kernel line in grub.conf but it hasn't helped. > I've checked options in bios but haven't found anything interesting. > > Any clues what to do next? Hello Rafal, can you please check the elrepo.org version of the 8169 driver? For CentOS5: elrepo/el5/x86_64/RPMS/kmod-r8169-6.016.00-1.el5.elrepo.x86_64.rpm This changes this one kernel network driver to a completely different version, but is said to help a lot... (I have one such network card, but that seems to work stable with the normal/stock CentOS-6 version.) best regards, Florian La Roche