Can not perform ChatServer and ChatClient, help me!

Projects General Guidance
3 
IPAddress ip(192,168,1, 27); // same with my Notebook LAN IP address

IPAddress ip(192,168,1, 42); // same with my Netbook LAN IP address

Are you saying those are the IP addresses of your notebook and netbook?

Yes, this is IP address of Ethernet adapter Local Area Connection of my notebook and netbook.

dxw00d:
They should be the IP address you are giving your Arduino, and must be different (in the last number) to any other device on your network.

I GIVE IP address to my Arduino Ethernet Shield? any number?