Reason Analysis:
The communication within the LAN is different from that of the home user, and the way of using the Internet is its own IP address. The so-called LAN, can do such a metaphor; the so-called point of line, a lot of points can constitute a line, LAN above each IP address is a point, a lot of IP address constitutes a local area network. LAN needs to communicate with the outside of the Internet, you need a point to the LAN outside, this point is called a gateway, if the local area network closed fill error, then the computer with its own IP address is able to communicate with other computers in the LAN, but he will never get out of the LAN, In other words, it's not on the Internet.
Solution:
Check the machine gateway on the computer next to the machine, then fill out the gateway on this machine and try the Internet again.