What I'm going to explain is happening on two different servers with same OS, same hardware and same hardware upgrade. IMHO I think may be a driver error is going on, but don't know how to figure it out.

I'm having some strange troubles with this server which is based on a supermicro motherboard.

The server runs red hat linux.

The server "hangs" when I do "ifconfig eth2 down" , also with eth3.

This eth2 and eht3 belong to a new pci card added last week.

Eth0 and eth1 are integrated on the motherboard and they work with igb driver. Eth2 and eth3 are the new ones on a pci and depends on e1000e driver.

Eth0 is configured as follows and is working fine.

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=none
IPADDR=10.0.16.49
NETMASK=255.255.255.0
NETWORK=10.0.16.0
HWADDR=00:xx:xx:xx:xx:5c

Eth1 is configured as follows and is working fine.

DEVICE=eth1
ONBOOT=yes
BOOTPROTO=none
IPADDR=192.168.16.46
NETMASK=255.255.255.0

Eth2 and eth3 have been configured in many ways, but to figure out which can be the problem I've connected them(one by one) to a network with dhcp, then call dhcpclient eth2 or eth3, and when ifconfig down the computer still hangs. So IMHO the configuration does not matter.

The modprobe.conf file looks as follows:

alias eth0 igb
alias eth1 igb
alias scsi_hostadapter ahci
install vtune_drv /opt/intel/vtune/mknod_vtune.sh
remove vtune_drv /opt/intel/vtune/rmnod_vtune.sh
alias char-major-10-111 mdm

igb and e1000e modules are loaded and I can see them with lsmod. If anyone would like to take a look to the lsmod output can do it here --> http://pastebin.com/jJ7kk8mn

what lspci shows on ehternet is at follows (2 first eth are eth0 and eth1)

01:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
01:00.1 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
03:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06)
03:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06)

lspci output can be checked here --> http://pastebin.com/j94fWUPw also the lspci with verbose can be seen here --> http://pastebin.com/HRdMttzm


The boot.log does not show any interesting information.

/var/log/messages --> http://pastebin.com/wLQnaxru

/var/log/kernel/info --> http://pastebin.com/3KzF9Hhu

And I don't know what else can be useful to be able to help me , but I will be willing to help on being helped. :)

Many thanks to all who read all this long post, sincerely.

Thanks.