Some handy ifconfig commands

# ifconfig eth0 down

# ifconfig eth0 up

# ifconfig eth0 10.8.210.25

# ifconfig eth0 netmask 255.255.255.192

# ifconfig eth0 broadcast 10.8.210.128

# ifconfig eth0 10.8.210.25 netmask 255.255.255.192 broadcast 10.8.210.128