Teredo is an IPv6 transition technology, used to give computers access to remote IPv6 resources (for example, web sites) over an IPv4 network. The NBA can decode Teredo sessions and extract emails and files, but it does not attempt to block them if policy triggers. The NBA does not decode SSL sessions that use Teredo.
NBA filters can identify Teredo sessions using the IPv6 address range '2001:0::/32'. You can create a filter to ignore Teredo sessions, but if you set an application filter to Analyze or Prohibit them, the action is automatically changed to Monitor.
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