Thread: Virgin Media Hijack customers browser search options
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Old 14-08-2009, 11:50   #23
Sir John Luke
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Re: Virgin Media Hijack customers browser search options
Sorry, wrong terminology. More correctly, DNS Hijacking

http://en.wikipedia.org/wiki/DNS_hijacking

In particular

"The concern with DNS hijacking has to do with this hijacking of the NXDOMAIN response. Internet applications rely on the NXDOMAIN response to describe the condition where the DNS has no entry for the specified host. If one were to query the invalid domain name (fakeexample.com), one should get a NXDOMAIN response - informing the application that the name is invalid and taking the appropriate action (for example, displaying an error). However, if the domain name is queried on one of these non-compliant ISPs, one would receive an IP address belonging to the ISP. In a Web browser, this behavior can be annoying or offensive as connections to this IP address display the Web page of the provider, sometimes with advertising, instead of a proper error message. However, other applications that reply on the NXDOMAIN error will instead try to connect to this IP address, potentially exposing sensitive information like logins."
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