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Common ifconfig commands.

# Display network settings of the first ethernet adapter
ifconfig wlan0

# Display all interfaces, even if down
ifconfig -a

# Take down / up the wireless adapter
ifconfig wlan0 {up|down}

# Set a static IP and netmask
ifconfig eth0 netmask

# You may also need to add a gateway IP
route add -net netmask gw

# Assign multiple IP's:
ifconfig dc0:0

# Assign second IP:
ifconfig dc0:1

# Assign IP/Subnet:
ifconfig dc0 inet netmask

# Assign Gateway:
route delete default && route add default