Wednesday, September 26, 2012

Direct Access Teredo Ping

Just noticed today that when a Direct Access client connected with Teredo is attempting to make contact with a host on the inside, it will first send an ICMP Echo request (i.e. Ping) to the host. If this fails, it will not be able to establish a connection. This could be relevant in complex environments with firewalls protecting various zones, such as the DMZ. Good to know...

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