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Two common techniques for bypassing pay-for-wireless providers are TCP -over- ICMP and TCP -over- DNS . In a nutshell, TCP is the protocol required to browse the web, ICMP is the protocol used by the command ping to determine if a host is available, and DNS is required to resolve domain names like to an IP address. When TCP is not completely available yet either ICMP or DNS is, then it is possible to encapsulate TCP connections over the other available protocol. Gogo blocked my ping attempts, hence TCP -over- ICMP was not possible. However, while Gogo doesn’t permit direct access to external DNS servers, Gogo’s DNS server recursively resolved the DNS queries I made. Therefore, Gogo appears to be susceptible to TCP -over- DNS . Despite not being able to verify this finding, I will simply state that Gogo can remedy this, if necessary, by only responding to white-listed DNS queries for non-authenticated users.


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