The machine has a static IP. If I try to change speed or autoneg or both the network completely stops. It starts working only after I issue service network restart.
Regards, Mangesh
On Tue, 21 Apr 2009, Michael Iatrou wrote:
When the date was Tuesday 21 April 2009, Mangesh S. Umbarje wrote:
I have checked the physical connectivity which is perfectlyfine. 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 andkernel-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.