802.11 Security

Configuring Network Interfaces

The three network interfaces need to be configured with the proper settings for the network layout we are putting together.

The file /etc/sysconfig/network-scripts/ifcfg-eth0 will contain the settings for eth0. If your ISP provides IP addresses by DHCP, the file should contain:

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=DHCP

Otherwise, it should contain the following:

DEVICE=eth0
ONBOOT=yes
BOOTPROTO=none
BROADCAST=192.0.2.255
NETWORK=192.0.2.0
NETMASK=255.255.255.0
IPADDR=192.0.2.230
GATEWAY=192.0.2.1
USERCTL=no

Replace NETWORK, BROADCAST, IPADDR, and GATEWAY with the proper values assigned to you by the ISP.

The file /etc/sysconfig/network-scripts/ifcfg-eth1 will contain the settings for the interface connected to the wired network:

DEVICE=eth1
BOOTPROTO=none
ONBOOT=yes
BROADCAST=192.168.1.255
NETWORK=192.168.1.0
NETMASK=255.255.255.0
IPADDR=192.168.1.1
USERCTL=no

This will set eth1 to have the IP address 192.168.1.1 and be connected to the network 192.168.1.0/24.

If the wireless network is going to be provided by using HostAP on the gateway itself, set up that interface as described in Chapter 9. Otherwise, eth2 will be connected to the access point and will be configured in /etc/sysconfig/network-scripts/ifcfg-eth1:

DEVICE=eth2
BOOTPROTO=none
ONBOOT=yes
BROADCAST=192.168.0.255
NETWORK=192.168.0.0
NETMASK=255.255.255.0
IPADDR=192.168.0.1
USERCTL=no

This will set eth2 to have the IP address 192.168.0.1 and be connected to the network 192.168.0.0/24.