Hi there, I have had severe problems with CentOS 6.x networking on machines that run CentOS 5.x just fine. After much headache and pain, the problem for me boiled down to crappy network drivers included with CentOS/RHEL 6.x. I have found updating the drivers to be very simple and it has always fixed my problems. The hardware I'm referring to has been using Intel e1000 or Intel e1000e drivers. So, without knowing a whole lot about your specific problem, I'm suggesting to try updating your underlying drivers.
For example: #e1000 rpm -Uvh http://ftp.osuosl.org/pub/elrepo/elrepo/el6/x86_64/RPMS/kmod-e1000-8.0.35-1.el6.elrepo.x86_64.rpm #e1000e rpm -Uvh http://ftp.osuosl.org/pub/elrepo/elrepo/el6/x86_64/RPMS/kmod-e1000e-1.11.3-1.el6.elrepo.x86_64.rpm hope this helps, Chris
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