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Interview Q & A >> WCF >> What is it the Teredo? How we can use it?

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What is it the Teredo? How we can use it? (Views: 4861)


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Teredo is a tunneling protocol designed to grant IPv6 connectivity to nodes that are located behind IPv6-unaware NAT devices. It defines a way of encapsulating IPv6 packets within IPv4 UDP datagrams that can be routed through NAT devices and on the IPv4 internet.

Submitted By: Mike | Created On: 8/7/2009 9:18:54 PM

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6to4,the most common IPv6 over IPv4 tunneling protocol, requires the tunnelendpoint to have a public IPv4 address. However, many hosts arecurrently attached to the IPv4 Internet through one or several NATdevices, usually because of IPv4 address shortage.In such a situation, the only available public IPv4 address is assignedto the NAT device, and the 6to4 tunnel endpoint needs to be implementedon the NAT device itself. Many NAT devices currently deployed, however,cannot be upgraded to implement 6to4, for technical or economic reasons.

Teredo alleviates this problem by encapsulating IPv6 packets withinUDP/IPv4 datagrams, which most NATs can forward properly. Thus,IPv6-aware hosts behind NATs can be used as Teredo tunnel endpointseven when they don't have a dedicated public IPv4 address. In effect, ahost implementing Teredo can gain IPv6 connectivity with no cooperationfrom the local network environment.

Teredo is intended to be a temporary measure: in the long term, allIPv6 hosts should use native IPv6 connectivity. The Teredo protocolincludes provisions for a sunset procedure: Teredoimplementation should provide a way to stop using Teredo connectivitywhen IPv6 has matured and connectivity becomes available using a lessbrittle mechanism.


Submitted By: Steve | Created On: 8/7/2009 9:20:53 PM

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Teredo is a tunneling protocol designed to grant IPv6 connectivity to nodes that are located behind IPv6-unaware NAT devices.

Submitted By: Satz | Created On: 8/9/2011 4:50:49 AM


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