Grab your IP

Often you need to know your IP, particularly when your are connected by DCHP kinda connection. So here are some handy tips :

CLI

• Displaying the current config for all NIC's :
  

  $ ifconfig



• Displaying the current config for a particular device :
  

  $ ifconfig device

  Example:

  $ ifconfig ppp0



• For knowing your IP via which you are accessing WWW:

  $ ifconfig  | grep 'P-t-P' | cut -d: -f2 | awk {'print $1'}

  OR

  $ wget -q -O- http://www.whatismyip.com/automation/n09230945.asp

  Here we are taking the help of http://www.whatismyip.com/


• Additional Jobs:
  
  Display the kernel’s IPv4 network neighbour cache:
  

  $ arp

  
  Display the kernel’s IP routing tables

  $ route

  
  Pinging:

  $ ping IP addr

  Example:

  $ ping 192.169.25.15

There are many more tools for advanced usage like nmap and others, but these are the basics.

SOURCE