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Permanent IP Settings

Primary: /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=static
BROADCAST=172.16.10.63
IPADDR=172.16.10.33
NETMASK=255.255.255.224
NETWORK=172.16.10.32
ONBOOT=yes

Secondary: /etc/sysconfig/network-scripts/ifcfg-eth0:0

BROADCAST=192.168.0.255
IPADDR=192.168.0.1
NETMASK=255.255.255.0
NETWORK=192.168.0.0

Secondary: /etc/sysconfig/network-scripts/ifcfg-eth0:1

BROADCAST=172.16.10.127
IPADDR=172.16.10.100
NETMASK=255.255.255.224
NETWORK=172.16.10.96

Gateway: /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=RedhatBox
GATEWAY=172.16.10.1

DNS: /etc/resolv.conf

nameserver 192.9.9.3

Temporary IP settings

Primary

# ifconfig eth0 192.168.1.4 netmask 255.255.255.0 broadcast 192.168.1.255

Secondary

# ifconfig eth0:0 10.10.10.1 netmask 255.255.255.0 broadcast 10.10.10.255

List main route table

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     0.0.0.0         255.255.255.240 U     0      0        0 br0
192.168.0.16    0.0.0.0         255.255.255.240 U     0      0        0 br0
192.168.0.32    0.0.0.0         255.255.255.224 U     0      0        0 br0
192.168.0.64    0.0.0.0         255.255.255.192 U     0      0        0 br0
192.168.0.192   192.168.0.60    255.255.255.192 UG    0      0        0 br0
192.168.0.128   0.0.0.0         255.255.255.192 U     0      0        0 br0
10.10.10.128    0.0.0.0         255.255.255.192 U     0      0        0 br0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 br0

Add/Delete Routes Temporary

# route add -host 10.10.10.129 dev eth1
# route add -net 10.10.10.128/26 dev eth0
# route add -net 172.16.10.1/24 gw 10.10.10.130
# route del -net 192.168.1.0/24 dev eth1
# route del default
# route add default gw 10.10.10.129 dev eth1