When the date was Tuesday 21 April 2009, Mangesh S. Umbarje wrote: > I have checked the physical connectivity which is perfectly > fine. This machine is very critical which we need to keep running as much > as possible. So I had gone to older kernel 2.6.18-92.1.17.el5. But along > with this kernel, I had added one more Dlink ethernet card which shows to > be > > 05:09.0 Ethernet controller: D-Link System Inc DGE-530T Gigabit Ethernet > Adapter (rev 11) (rev 11) > > and it uses the skge driver. > > So I could test the machine with this new card and > kernel-2.6.18-92.1.17.el5 togather. Still I do get the network breaks but > the frequency reduced to factor of Ten. The corresponding messages seen > in the /var/log/messages are as follow. > > Apr 21 10:18:32 kernel: skge eth1: Link is down. > Apr 21 10:18:36 kernel: skge eth1: Link is up at 1000 Mbps, full duplex, > flow control none Apr 21 10:18:55 kernel: skge eth1: Link is down. > Apr 21 10:18:57 kernel: skge eth1: Link is up at 1000 Mbps, full duplex, > flow control none Apr 21 10:18:58 kernel: skge eth1: Link is down. > Apr 21 10:19:01 kernel: skge eth1: Link is up at 1000 Mbps, full duplex, > flow control none Try to disable auto-negotiation for the NIC, using ethtool. Set manually the speed to 100 and then 1000 Mbps and see what happens. The machine has static IP or it uses DHCP? It's a good idea to do some traffic capture and check if there is any correlation between the traffic and the link state. -- Michael Iatrou