Teredo RelaysĪ Teredo relay is an IPv6/IPv4 router that can forward packets between Teredo clients on the IPv4 Internet (using a Teredo tunneling interface) and IPv6-only hosts. To facilitate communication between Windows-based Teredo client computers, Microsoft has deployed Teredo servers on the IPv4 Internet. Unlike the client, the Teredo server is not included with Microsoft operating platforms. The Teredo server listens on UDP port 3544 for Teredo traffic. The general role of the Teredo server is to assist in the address configuration of Teredo clients and to facilitate the initial communication between Teredo clients and other Teredo clients or between Teredo clients and IPv6-only hosts.

Teredo ServersĪ Teredo server is an IPv6/IPv4 node that is connected to both the IPv4 Internet and the IPv6 Internet, and supports a Teredo tunneling interface over which packets are received.

Windows XP with Service Pack 1 (SP1) with the Advanced Networking Pack, Windows XP with Service Pack 2 (SP2), Windows Server 2003 with Service Pack 1 (SP1),Windows Server 2003 with Service Pack 2 (SP2), Windows Vista, and Windows Server 2008 all include the Teredo client. A Teredo client communicates with a Teredo server to obtain an address prefix from which a Teredo-based IPv6 address is configured or used to facilitate communication with other Teredo clients or hosts on the IPv6 Internet. The Teredo infrastructure consists of the following components: Teredo ClientsĪ Teredo client is an IPv6/IPv4 node that supports a Teredo tunneling interface through which packets are tunneled to other Teredo clients or nodes on the IPv6 Internet (via a Teredo relay).

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