Members of the Internet engineering community have raised several new security concerns about Teredo, a mechanism for sending IPv6 traffic over IPv4 networks that comes turned on by default in Microsoft’s Vista software.
Symantec and Ericsson security experts who called attention to the issue say they are concerned that Teredo bypasses network security
through such devices as firewalls. Microsoft says it is providing Symantec with feedback on its report, stressed that Teredo
is primarily designed for consumers and emphasized that "Teredo gets disabled automatically for enterprises when a domain
environment is detected" (full Microsoft response here).
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