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IPv6 Helper Service (System Services for the Windows Server 2003 Family and Windows XP Operating Systems)

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Service Name: 6to4

Executable Name: svchost.exe –k netsvcs

Log On As: LocalSystem

Description: Offers IPv6 connectivity over an existing IPv4 network. 6to4 allows IPv6-enabled sites and hosts to communicate by using IPv6 over an IPv4 infrastructure (for example, the Internet). IPv6 sites and hosts can use their 6to4 address prefix and the Internet to communicate without obtaining an IPv6 global address prefix from an Internet service provider and connecting to the 6bone (the IPv6-enabled portion of the Internet).

6to4 is a tunneling technique that is described in RFC 3056. 6to4 hosts do not require any manual configuration and create 6to4 addresses by using standard auto configuration. 6to4 uses the global address prefix of 2002:WWXX:YYZZ::/48, where WWXX:YYZZ is the colon-hexadecimal representation of a public IPv4 address (w.x.y.z) that is assigned to a site or host. WWXX:YYZZ is the Next Level Aggregator (NLA) portion of a 6to4 address.

The IPv6 Helper service also supports 6over4, also known as IPv4 multicast tunneling, is a tunneling technique that is described in RFC 2529. 6over4 allows IPv6 and IPv4 nodes to communicate by using IPv6 over an IPv4 infrastructure. 6over4 uses the IPv4 infrastructure as a multicast-capable link. In order for 6over4 to work correctly, the IPv4 infrastructure must be IPv4 multicast-enabled.

If this service is stopped or disabled, the computer will only have IPv6 connectivity if connected to a native IPv6 network.

For more information about IPv6, see "Introduction to IPv6" and "Windows IPv6" in the Windows Server Resource Kit Networking Guide.

Available on: Windows XP Home, Windows XP Professional; Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition and Windows Server 2003, Web Edition.

Installed through: Network Connections, Protocol

Startup type: Automatic

Service status: Started

This service depends on the following system components:

Remote Procedure Call

Windows Management Instrumentation

Event Log

TCP/IP Protocol Driver

Microsoft IPv6 Protocol Driver

The following system components depend on this service: None

IP Port Numbers used: None

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