• Non-Configurable Parameters
  • DhcpSubnetMaskOpt
  • LeaseObtainedTime
  • LeaseTerminatesTime
  • Parameters Configurable Using the Route Command




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    Parameters Configurable Using the Route Command


    The route command can store persistent IP routes as values under the Tcpip\Parameters\PersistentRoutes registry key. Each route is stored in the value name string as a comma-delimited list of the form:

    destination,subnet mask,gateway,metric

    For example, the command:

    route add 10.99.100.0 MASK 255.255.255.0 10.99.99.1 METRIC 1 /p

    produces the registry value:

    10.99.100.0,255.255.255.0,10.99.99.1,1



    The value type is a REG_SZ. There is no value data (empty string). Addition and deletion of these values can be accomplished using the route command. There should be no need to configure them directly.

    Non-Configurable Parameters


    The following parameters are created and used internally by the TCP/IP components. They should never be modified using the Registry Editor. They are listed here for reference only.
    DhcpDefaultGateway

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_MULTI_SZ—list of dotted decimal IP addresses

    Valid Range: Any set of valid IP addresses

    Default: None

    Description: This parameter specifies the list of default gateways to be used to route packets that are not destined for a subnet to which the computer is directly connected and for which a more specific route does not exist. This parameter is written by the DHCP client service, if enabled. This parameter is overridden by a valid DefaultGateway parameter value. Although this parameter is set on a per-interface basis, there is always only one default gateway active for the computer. Additional entries are treated as alternatives if the first one is down.
    DhcpIPAddress

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_SZ—dotted decimal IP address

    Valid Range: Any valid IP address

    Default: None

    Description: This parameter specifies the DHCP-configured IP address for the interface. If the IPAddress parameter contains a first value other than 0.0.0.0, that value overrides this parameter.
    DhcpDomain

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_SZ—Character string

    Valid Range: Any valid DNS domain name

    Default: None (provided by DHCP server)

    Description: This parameter specifies the DNS domain name of the interface. In Windows Server 2003, this and NameServer are now per-interface parameters, rather than system-wide parameters. If the Domain key exists, it overrides the DhcpDomain value.
    DhcpNameServer

    Key: Tcpip\Parameters

    Value Type: REG_SZ—A space delimited list of dotted decimal IP addresses

    Valid Range: Any set of valid IP address

    Default: None

    Description: This parameter specifies the DNS name servers to be queried by Windows Sockets to resolve names. It is written by the DHCP client service, if enabled. If the NameServer parameter has a valid value, it overrides this parameter.
    DhcpServer

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_SZ—dotted decimal IP address

    Valid Range: Any valid IP address

    Default: None

    Description: This parameter specifies the IP address of the DHCP server that granted the lease on the IP address in the DhcpIPAddress parameter.
    DhcpSubnetMask

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_SZ—dotted decimal IP subnet mask

    Valid Range: Any subnet mask that is valid for the configured IP address

    Default: None

    Description: This parameter specifies the DHCP-configured subnet mask for the address specified in the DhcpIPAddress parameter.
    DhcpSubnetMaskOpt

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_SZ—dotted decimal IP subnet mask

    Valid Range: Any subnet mask that is valid for the configured IP address

    Default: None

    Description: This parameter is filled in by the DHCP client service and is used to build the DhcpSubnetMask parameter, which the stack actually uses. Validity checks are performed before the value is inserted into the DhcpSubnetMask parameter.
    Lease

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_DWORD—time in seconds

    Valid Range: 1–0xFFFFFFFF

    Default: None

    Description: The DHCP client service uses this parameter to store the time, in seconds, for which the lease on the IP address for this adapter is valid.
    LeaseObtainedTime

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_DWORD—absolute time, in seconds, since midnight of 1/1/70

    Valid Range: 1–0xFFFFFFFF

    Default: None

    Description: The DHCP client service uses this parameter to store the time at which the lease on the IP address for this adapter was obtained.
    LeaseTerminatesTime

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_DWORD—absolute time, in seconds, since midnight of 1/1/70

    Valid Range: 1–0xFFFFFFFF

    Default: None

    Description: The DHCP client service uses this parameter to store the time at which the lease on the IP address for this adapter expires.
    LLInterface

    Key: Tcpip\Parameters\Adapters\interfaceGUID

    Value Type: REG_SZ—Windows Server 2003 device name

    Valid Range: A legal Windows Server 2003 device name

    Default: Empty string (blank)

    Description: This parameter is used to direct IP to bind to a different link-layer protocol than the built-in ARP module. The value of the parameter is the name of the Windows Server 2003 device to which IP should bind. This parameter is used in conjunction with the RAS component, for example. It is only present when ARP modules other than LAN bind to IP.
    NTEContextList

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_MULTI_SZ—number

    Valid Range: 0–0xFFFF

    Default: none

    Description: This parameter identifies the context of the IP address associated with an interface. Each IP address associated with an interface has its own context number. The values are used internally to identify an IP address and should not be altered.
    T1

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_DWORD—absolute time, in seconds, since midnight of 1/1/70

    Valid Range: 1–0xFFFFFFFF

    Default: None

    Description: The DHCP client service uses this parameter to store the time at which the service first tries to renew the lease on the IP address for the adapter by contacting the server that granted the lease.
    T2

    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_DWORD—absolute time, in seconds, since midnight of 1/1/70

    Valid Range: 1–0xFFFFFFFF

    Default: None

    Description: The DHCP client service uses this parameter to store the time at which the service tries to renew the lease on the IP address for the adapter by broadcasting a renewal request. Time T2 should only be reached if the service is unable to renew the lease with the original server for some reason.


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    Parameters Configurable Using the Route Command

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