Cisco Cisco NAC Appliance 4.9.4 Installation Guide
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Configuring Additional NIC Cards
The Configuration Utility script requires that the CAM and CAS machines come with eth0 (NIC1) and
eth1 (NIC2) interfaces by default and prompts you to configure these during initial installation. If your
system has additional network interface cards (e.g. NIC3, NIC4), you can use the following
instructions to configure the additional interfaces (e.g. eth2, eth3) on those cards. Typically, eth2 needs
to be configured when setting up CAS systems for High Availability. For HA, once the eth2 (NIC3)
interface is configured with the proper addressing, it can then be configured as the dedicated UDP
heartbeat interface for the HA-CAS.
eth1 (NIC2) interfaces by default and prompts you to configure these during initial installation. If your
system has additional network interface cards (e.g. NIC3, NIC4), you can use the following
instructions to configure the additional interfaces (e.g. eth2, eth3) on those cards. Typically, eth2 needs
to be configured when setting up CAS systems for High Availability. For HA, once the eth2 (NIC3)
interface is configured with the proper addressing, it can then be configured as the dedicated UDP
heartbeat interface for the HA-CAS.
Note
For Cisco NAC Appliance hardware platforms, the following instructions assume that the
NIC is plugged in and “working” (i.e. recognized by BIOS and by Linux).
NIC is plugged in and “working” (i.e. recognized by BIOS and by Linux).
To Configure an Additional NIC
Step 1
To verify that the NIC has been recognized by Linux, type
ifconfig eth
n
(where n is the
interface number). For example, if adding a NIC to a system that already has two built-in
Ethernet interfaces (eth0 and eth1), n is 2 and you enter
Ethernet interfaces (eth0 and eth1), n is 2 and you enter
ifconfig eth2
.
Step 2
You should see information about the interface including MAC address, and transmit and
receive counters. This means the interface is recognized by Linux and can be used.
receive counters. This means the interface is recognized by Linux and can be used.
Step 3
Change to the following directory:
cd /etc/sysconfig/network-scripts
Step 4
Use vi to edit the
ifcfg-ethn
file for the interface, for example:
vi ifcfg-eth2
Step 5
Add the following lines into the file—replacing
IPADDR
,
NETMASK
,
BROADCAST
, and
NETWORK
values
with the actual values suitable for your network:
DEVICE=eth2
IPADDR=192.168.0.253
NETMASK=255.255.255.252
BROADCAST=192.168.0.255
NETWORK=192.168.0.252
BOOTPROTO=static
ONBOOT=yes
TYPE=Ethernet
Step 6
Save the file and reboot the system. The network interface is now ready to be used for HA.