The hacker who broke into the telephone system might use this technique to redirect people buying with credit cards to his own phone number, then pretend to be the real vendor, then steal the credit card numbers. In much the same way, hackers use this DNS spoof in order to redirect people to their own website. This symptom is caused when two different copies of a DNS response have been received. However, we are finding that home users are seeing such behavior from ISPs. Some ISPs attempt to re-direct users through their own caching servers.
Details See DNS spoofing for more information.
More about the DNS service. Network ICE Corporation.