Cainiao is anxious to ask for help. ubuntu9.10 cannot access the Internet.

Cainiao is anxious to ask for help. ubuntu9.10 cannot be connected to the Internet-Linux general technology-Linux technology and application information. The following is a detailed description. I installed windows XP and ubuntu9.10. I have a normal Intranet and Internet in windows, but in ubuntu
But it can only be used on the Intranet, but not on the Internet.
I use a LAN, drcom client, and the client can log on normally, but cannot log on to the Internet. And it was normal before. I don't know how it works after the winter vacation.
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I reinstalled it once, but it still cannot be solved. Dns, dhcp, and ip are all correct.
Wait for the experts to solve the problem.