for example: [andy at node01 /]$ cat /sys/class/net/ib0/address 80:00:00:48:fe:80:00:00:00:00:00:00:f4:52:14:03:00:78:3d:4 [andy at node01 /]$ cat /etc/sysconfig/network-scripts/ifcfg-ib0 DEVICE="ib0" TYPE=Infiniband ONBOOT="yes" BOOTPROTO="static" NM_CONTROLLED="yes" HWADDR=80:00:00:48:fe:80:00:00:00:00:00:00:f4:52:14:03:00:78:3d:41 NETWORK=192.168.200.0 BROADCAST=192.168.200.255 IPADDR=192.168.200.101 NETMASK=255.255.255.0 ifcfg-ib0 file made by hand, because we integrate the cards later. Sincerely Andy