Without more detail it is difficult to tell exactly what you are trying to re-ip. If it is the Service Console that you are trying to change the IP address on you can do this from the command line interface on the ESX Server
Type “esxcfg-vswif -l” to see the current config
Type “esxcfg-vswif -i <new ip> -n <new subnet mask> vswif0” to change the IP address
Type “service mgmt-vmware restart” to restart the management agent
Type “nano /etc/sysconfig/network” to add the new gateway, edit the line GATEWAY=<new gateway ip>
Type “service network restart” to restart the SC networking
Then make sure your DNS is updated, also if you are using VLANs and the new IP is not included in the VLAN ID’s for the vswitch then you also need to run the below command:
esxcfg-vswitch -p <SC PortGroup Name> -v <new VLANID> vSwitch0
It’s also possible to do this through the VI client but you will usually be dis-connected when doing it. It’s under Configuration, Networking, then go to the properties of the vswitch with your service console (usually vSwitch0), select the Service Console, click Edit, then select Continue Modifying Connection , then click the Edit button.
You do not assign non-service console nic’s an IP address (except for the vKernel). The IP address gets assigned to the VM’s and the VM nic’s are basically just an uplink port for the virtual switches.