How to get your network ip

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http://askubuntu.com – I am on a network with PPPoE connection for internet acces.I want to find out my network ipv4. Example: -on Windows 7 I can see both my PPPoE's connection ip and local network ip, either from properties of the connection, either from cmd with ipconfig command -on ubuntu I can only see the PPPoE's ip I cam across this problem after trying to lookup another ubuntu pc on the network. How can I check my Local area connection(Windows terms) ip and/or how to see the other ubuntu pc from my network? If I connect to my DSL account I can see my ip(ipv4 and 6) from my DSL connection but not my et (HowTos)