# How Can I Manually Configure an IP Address for an InfiniBand NIC?

IP over InfiniBand (IPoIB) allows IP data transmission over InfiniBand. For SUSE high-performance H2 and HL1 ECSs, if IPoIB is required, you must manually configure an IP address for the InfiniBand NIC after installing the InfiniBand NIC driver.

#### Prerequisites

The InfiniBand NIC driver has been installed on the high-performance H2 or HL1 ECSs.

#### Background

To prevent IP address conflict of the InfiniBand NICs configured for the ECSs of a tenant, determine the IP address to be configured for an InfiniBand NIC according to the IP addresses available in the VPC. The method is as follows:

For example, if the first two eight-bits of the IP address (specified by IPADDR) to be configured for the InfiniBand NIC are consistently 169.254, the latter two eight-bits must be the same as those of the eth0 IP address, and the subnet mask must be the same as that of the eth0 NIC.

An example is provided as follows:

If the IP address of the eth0 NIC is 192.168.0.100/24, the IP address to be configured for the InfiniBand NIC is 169.254.0.100/24.

#### Procedure

1. Log in to the ECS.
2. Run the following command to switch to user root:

   sudo su -

3. Run the following command to edit the /etc/sysconfig/network/ifcfg-ib0 file:

   vi /etc/sysconfig/network/ifcfg-ib0

4. Enter the following information:

   DEVICE=ib0

   BOOTPROTO=static

   IPADDR=IP address to be configured for the InfiniBand NIC

   NETMASK=Subnet mask

   STARTMODE=auto

   For instructions about how to obtain the IP address and subnet mask for an InfiniBand NIC, see Background.

5. Run the following command to restart the network for the configuration to take effect:

   service network restart

Parent topic: Network Configurations