TCP/IPv6 Configurable Registry Settings

Windows Mobile 6.5
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The following subkeys apply to TCP/IPv6 only. You can set all other configurable parameters by using the ipv6.exe utility.

Per-interface settings are not configurable in the registry, but are configurable by using the ipv6.exe utility. These settings can be persisted in registry by the OS over reboots with the use of -p flag in IPv6.

The following table shows the registry values for the HKEY_LOCAL_MACHINE\Comm\Tcpip6\Parms registry key.

Value : type Description

DefaultCurHopLimit : REG_WORD

Default setting is 128. Specifies the current hop limit.


Default setting is 5353. The port to use for LLMNR queries over TCP and UDP.

LLMNRv6Address : REG_SZ

Default setting is FF02:0:0:0:0:0:1:3. The IPv6 address to use for Link-Local Multicast Name Resolution (LLMNR) queries.

TcpTimedWaitDelay : REG_DWORD

Default setting is 240. The valid range for this value is 30 to 300 milliseconds. This value determines the length of time that a connection stays in the TIME_WAIT state when being closed. While a connection is in the TIME_WAIT state, the socket pair cannot be re-used.

The following table shows the registry values for the HKEY_LOCAL_MACHINE\Comm\Tcpip6\Parms\GlobalParams registry key.

Value : type Description

UseTemporaryAddresses : REG_DWORD

Default setting is 1. Specifies whether temporary addresses should be used. A value of 0 disables the creation of temporary IPv6 addresses.

The following table shows the host-specific values for the HKEY_LOCAL_MACHINE\Comm\Tcpip\Hosts\<Host Name> subkey.

Value : type Description

ipaddr6 : REG_BINARY

This value stores the IPv6 addresses associated with this host name. The length of this value is 20 bytes per address (16 bytes for address and 4 bytes for Scope ID).

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