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Covert channel tool hides data in IPv6
Robert Lemos, SecurityFocus 2006-08-11

An independent security researcher showed off an early version of a tool for creating covert channels that, he claims, can pass undetected through most firewalls and intrusion detection systems.

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Just another "default accept" problem 2006-08-14
Wes Felter
It has been known for years that a firewall with a default accept policy has more holes than swiss cheese. A default deny firewall will not pass anything that it does not recognize (like IPv6 o 6to4), thus closing this hole. Nothing new here....

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