TCP/IP parameters for Windows XP:

The TCP/IP parameters are registry values that are located under one of two different subkeys of:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services Tcpip\Parameters Tcpip\Parameters\Interfaces\ID of the Adapter


Standard parameters


These parameters are installed with default values by the Network tool in Control Panel during the installation of the TCP/IP components.You can use Registry Editor to modify them.

DatabasePath

Key: Tcpip\Parameters Value Type: REG_EXPAND_SZ - Character string Valid Range: A valid Windows NT file path Default: %SystemRoot%\System32\Drivers\Etc Description: This parameter specifies the path of the standard Internet database files (HOSTS, LMHOSTS, NETWORKS, PROTOCOLS).It is used by the Windows Sockets interface.


ForwardBroadcasts

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: Forwarding of broadcasts is not supported.This parameter is ignored.


UseZeroBroadcast

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: If this parameter is set to 1 (True), the IP will use zeros-broadcasts (0.0.0.0) instead of ones-broadcasts (255.255.255.255).Most computers use ones-broadcasts, but some computers that are derived from BSD implementations use zeros-broadcasts.Computers that use different broadcasts do not interoperate well on the same network.


Optional parameters


These parameters do not exist in the registry.You can create them to modify the default behavior of the TCP/IP protocol driver.

ArpAlwaysSourceRoute

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0,1 (False or True) Default: 0 (False) Description: If you set this parameter to 1, TCP/IP transmits ARP queries with source routing enabled on Token Ring networks.By default, the stack transmits ARP queries without source routing first and retries with source routing enabled if no reply was received.


ArpUseEtherSNAP

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0,1 (False or True) Default: 0 (False) Description: If you set this parameter to 1, TCP/IP transmits Ethernet packets using 802.3 SNAP encoding.By default, the stack transmits packets in DIX Ethernet format.It will always receive both formats.


DefaultTTL

Key: Tcpip\Parameters Value Type: REG_DWORD - Number of seconds/hops Valid Range: 1-255 Default: 128 for Windows XP Description: This parameter specifies the default Time To Live (TTL) value that is set in the header of outgoing IP packets.The TTL determines the maximum time that an IP packet can live in the network without reaching its destination.It is effectively a limit on the number of routers an IP packet can pass through before it is discarded.


EnableDeadGWDetect

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0,1 (False, True) Default: 1 (True) Description: If you set this parameter to 1, TCP uses the Dead Gateway Detection feature.With this feature, TCP requests IP to change to a backup gateway if it retransmits a segment several times without receiving a response.Backup gateways may be defined in the Advanced section of the TCP/IP configuration dialog box in the Network Control Panel.


EnablePMTUBHDetect

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0,1 (False, True) Default: 0 (False) Description: If you set this parameter to 1 (True), TCP tries to detect "Black Hole" routers while doing Path MTU Discovery.A "Black Hole" router does not return ICMP Destination Unreachable messages when it must fragment an IP datagram with the Don't Fragment bit set.TCP must receive these messages to perform Path MTU Discovery.With this feature enabled, TCP will try to send segments without the Don't Fragment bit set if several retransmissions of a segment are unacknowledged.If the segment is acknowledged, the MSS will be decreased and the Don't Fragment bit will be set in future packets on the connection.Enabling black hole detection increases the maximum number of retransmissions that are performed for a particular segment.


EnablePMTUDiscovery

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0,1 (False, True) Default: 1 (True) Description: If you set this parameter to 1 (True), TCP tries to discover the Maximum Transmission Unit (MTU or largest packet size) over the path to a remote host.By discovering the Path MTU and limiting TCP segments to this size, TCP can eliminate fragmentation at routers along the path that connect networks with different MTUs.Fragmentation adversely affects TCP throughput and causes network congestion.If you set this parameter to 0, an MTU of 576 bytes is used for all connections that are not to computers on the local subnet.


ForwardBufferMemory

Key: Tcpip\Parameters Value Type: REG_DWORD - Number of bytes Valid Range: network MTU - some reasonable value smaller than 0xFFFFFFFF Default: 74240 (sufficient for fifty 1480-byte packets, rounded to a multiple of 256) Description: This parameter determines how much memory IP allocates to store packet data in the router packet queue.When this buffer space is filled, the router starts to discard packets at random from its queue.Packet queue data buffers are 256 bytes in length.Therefore, the value of this parameter must be a multiple of 256.Multiple buffers are chained together for larger packets.The IP header for a packet is stored separately.This parameter is ignored and no buffers are allocated if the IP router is not enabled.


IGMPLevel

Key: Tcpip\Parameters Value Type: REG_DWORD - Number Valid Range: 0,1,2 Default: 2 Description: This parameter determines how well the computer supports IP multicasting and participates in the Internet Group Management Protocol.At level 0, the computer provides no multicast support.At level 1, the computer can only send IP multicast packets.At level 2, the computer can send IP multicast packets and fully participate in IGMP to receive multicast packets.


KeepAliveInterval

Key: Tcpip\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 1 - 0xFFFFFFFF Default: 1000 (one second) Description: This parameter determines the interval that separates keepalive retransmissions until a response is received.After a response is received, KeepAliveTime again controls the delay until the next keepalive transmission.The connection is aborted after the number of retransmissions that are specified by TcpMaxDataRetransmissions are unanswered.


KeepAliveTime

Key: Tcpip\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 1 - 0xFFFFFFFF Default: 7,200,000 (two hours) Description: The parameter controls how frequently TCP tries to verify that an idle connection is still intact by sending a keepalive packet.If the remote computer is still reachable and functioning, the remote computer acknowledges the keepalive transmission.By default, keepalive packets are not sent.A program can turn on this feature on a connection.


MTU

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD Number Valid Range: 68 - the MTU of the underlying network Default: 0xFFFFFFFF Description: This parameter overrides the default Maximum Transmission Unit (MTU) for a network interface.The MTU is the maximum packet size in bytes that the transport transmits over the underlying network.The size includes the transport header.An IP datagram can span multiple packets.Values larger than the default value for the underlying network cause the transport to use the network default MTU.Values smaller than 68 cause the transport to use an MTU of 68.


NumForwardPackets

Key: Tcpip\Parameters Value Type: REG_DWORD Number Valid Range: 1 - some reasonable value smaller than 0xFFFFFFFF Default: 50 Description: This parameter determines the number of IP packet headers that are allocated for the router packet queue.When all headers are in use, the router begins to discard packets at random from the queue.This value should be at least as large as the ForwardBufferMemory value divided by the maximum IP data size of the networks that are connected to the router.This value must be no larger than the ForwardBufferMemory value divided by 256 because at least 256 bytes of forward buffer memory are used for each packet.The optimal number of forward packets for a particular ForwardBufferMemory size depends on the type of traffic that is carried on the network and will be somewhere between these two values.This parameter is ignored and no headers are allocated if the router is not enabled.


TcpMaxConnectRetransmissions

Key: Tcpip\Parameters Value Type: REG_DWORD - Number Valid Range: 0 - 0xFFFFFFFF Default: 2 Description: This parameter determines the number of times that TCP retransmits a connect request (SYN) before aborting the attempt.The retransmission timeout is doubled with each successive retransmission in a particular connect attempt.The initial timeout value is three seconds.


TcpMaxDataRetransmissions

Key: Tcpip\Parameters Value Type: REG_DWORD - Number Valid Range: 0 - 0xFFFFFFFF Default: 5 Description: This parameter controls the number of times that TCP retransmits an individual data segment (non-connect segment) before it aborts the connection.The retransmission timeout is doubled with each successive retransmission on a connection.It is reset when responses resume.The base timeout value is dynamically determined by the measured round-trip time on the connection.


TcpNumConnections

Key: Tcpip\Parameters Value Type: REG_DWORD - Number Valid Range: 0 - 0xfffffe Default: 0xfffffe Description: This parameter limits the maximum number of connections that TCP can have open at the same time.


TcpTimedWaitDelay

Key: Tcpip\Parameters Value Type: REG_DWORD - Time in seconds Valid Range: 30-300 (decimal) Default: 0xF0 (240 decimal) Description: This parameter determines the time that a connection stays in the TIME_WAIT state when it is closing.While a connection is in the TIME_WAIT state, the socket pair cannot be re-used.This is also known as the "2MSL" state.According to RFC, the value should be two times the maximum segment lifetime on the network.See RFC793 for more details.


TcpUseRFC1122UrgentPointer

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0,1 (False, True) Default: 0 (False) Description: This parameter determines whether TCP uses the RFC 1122 specification for urgent data or the mode that is used by BSD-derived computers.The two mechanisms interpret the urgent pointer in the TCP header and the length of the urgent data differently.They are not interoperable.By default, Windows XP uses the BSD mode.


TcpWindowSize

Key: Tcpip\Parameters Value Type: REG_DWORD - Number of bytes Valid Range: 0 - 0xFFFF Default: The smaller of 0xFFFF OR (The larger of four times the maximum TCP data size on the network OR 8192 rounded up to an even multiple of the network TCP data size.) The default is 8760 for Ethernet. Description: This parameter determines the maximum TCP receive window size of the computer.The receive window specifies the number of bytes a sender can transmit without receiving an acknowledgment.Generally, larger receive windows improve performance over high (delay * bandwidth) networks.For highest efficiency, the receive window must be an even multiple of the TCP Maximum Segment Size (MSS).


Parameters Configurable from the Connection Properties


These parameters are created and modified automatically by the connection properties interface through user-supplied information.You do not have to configure them directly in the registry.

DefaultGateway

Key: Tcpip\Parameters\Interfaces\ID for Adapter 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 gateways to route packets that are not destined for a subnet that the computer is directly connected to and that do not have a more specific route.This parameter overrides the DhcpDefaultGateway parameter.


Domain

Key: Tcpip\Parameters Value Type: REG_SZ - Character string Valid Range: Any valid DNS domain name Default: None Description: This parameter specifies the DNS domain name of the computer.It is used by the Windows Sockets interface.


EnableDhcp

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: If this parameter is set to 1 (True), the DHCP client service tries to use DHCP to configure the first IP interface on the adapter.


Hostname

Key: Tcpip\Parameters Value Type: REG_SZ - Character string Valid Range: Any valid DNS hostname Default: The computer name of the computer Description: This parameter specifies the DNS hostname of the computer that will be returned by the hostname command.


IPAddress

Key: Tcpip\Parameters\Interfaces\ID for Adapter 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 IP addresses of the IP interfaces to be bound to the adapter.If the first address in the list is 0.0.0.0, the primary interface on the adapter will be configured from DHCP.A computer with more than one IP interface for an adapter is known as "logically multihomed." There must be a valid subnet mask value in the SubnetMask parameter for each IP address that is specified in this parameter.


IPEnableRouter

Key: Tcpip\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: Setting this parameter to 1 (True) causes the computer to route IP packets between the networks that it is connected to.


NameServer

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 (Blank) Description: This parameter specifies the DNS name servers to be queried by Windows Sockets to resolve names.


SearchList

Key: Tcpip\Parameters Value Type: REG_SZ - Delimited list of DNS domain name suffixes Valid Range: Any set of valid DNS domain name suffixes Valid Range: Any set of valid DNS domain name suffixes Default: None Description: This parameter specifies a list of domain name suffixes to append to a name to be resolved by the DNS if resolution of the unadorned name fails.By default, the value of the Domain parameter is appended only.This parameter is used by the Windows Sockets interface.


SubnetMask

Key: Tcpip\Parameters\Interfaces\ID for Adapter 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 subnet masks to be used with the IP interfaces bound to the adapter.If the first mask in the list is 0.0.0.0, the primary interface on the adapter will be configured by DHCP.There must be a valid subnet mask value in this parameter for each IP address that is specified in the IPAddress parameter.


Non-configurable parameters


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

DhcpDefaultGateway

Key: Tcpip\Parameters\Interfaces\ID for Adapter 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 route packets that are not destined for a subnet that the computer is directly connected to, and that do not have a more specific route.This parameter is written by the DHCP client service, if enabled.This parameter is overridden by a valid DefaultGateway parameter value.


DhcpIPAddress

Key: Tcpip\Parameters\Interfaces\ID for Adapter 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 will override this parameter.


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.The NameServer parameter overrides this parameter.


DhcpServer

Key: Tcpip\Parameters\Interfaces\ID for Adapter 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\ID for Adapter 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 that is specified in the DhcpIPAddress parameter.


IPInterfaceContext

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD Valid Range: 0 - 0xFFFFFFFF Default: None Description: This parameter is written by the TCP/IP driver for use by the DHCP client service.


Lease

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD - Time in seconds Valid Range: 1 - 0xFFFFFFFF Default: None Description: This parameter is used by the DHCP client service to store the time (in seconds) that the lease on the IP address for this adapter is valid for.


LeaseObtainedTime

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD - Absolute time in seconds since midnight of 1/1/70 Valid Range: 1 - 0xFFFFFFFF Default: None Description: This parameter is used by the DHCP client service to store the time that the lease on the IP address for this adapter obtained.


LeaseTerminatesTime

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD - Absolute time in seconds since midnight of 1/1/70 Valid Range: 1 - 0xFFFFFFFF Default: None Description: This parameter is used by the DHCP client service to store the time that the lease on the IP address for this adapter expires.


LLInterface

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_SZ - NT device name Valid Range: A valid NT 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 NT-based device that IP should bind to.This parameter is used in conjunction with the RAS component, for example.


T1

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD - Absolute time in seconds since midnight of 1/1/70 Valid Range: 1 - 0xFFFFFFFF Default: None Description: This parameter is used by the DHCP client service to store the time that the service will first try to renew the lease on the IP address for the adapter.To renew the lease, he service contacts the server that granted the lease.


T2

Key: Tcpip\Parameters\Interfaces\ID for Adapter Value Type: REG_DWORD - Absolute time in seconds since midnight of 1/1/70 Valid Range: 1 - 0xFFFFFFFF Default: None Description: This parameter is used by the DHCP client service to store the time that the service will try to renew the lease on the IP address for the adapter.To renew the lease, the service broadcasts a renewal request.Time T2 should be reached only if the service was not able to renew the lease with the original server.


Standard Parameters Configurable from Registry Editor


These parameters are installed with default values by the Network tool in Control Panel during the installation of the TCP/IP components.They may be modified by using Registry Editor (Regedit.exe).

BcastNameQueryCount

Key: Netbt\Parameters Value Type: REG_DWORD - Count Valid Range: 1 to 0xFFFF Default: 3 Description: This value determines the number of times NetBT broadcasts a query for a particular name without receiving a response.


BcastQueryTimeout

Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 100 to 0xFFFFFFFF Default: 0x2ee ( 750 decimal) Description: This value determines the time interval between successive broadcast name queries for the same name.


CacheTimeout

Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 60000 to 0xFFFFFFFF Default: 0x927c0 ( 600000 milliseconds = 10 minutes) Description: This value determines the time interval that names are cached for in the remote name table.


NameServerPort

Key: Netbt\Parameters Value Type: REG_DWORD - UDP port number Valid Range: 0 - 0xFFFF Default: 0x89 Description: This parameter determines the destination port number that NetBT sends packets to that are related to name service, such as name queries and name registrations to WINS.The Microsoft WINS listens on port 0x89.NetBIOS name servers from other vendors can listen on different ports.


NameSrvQueryCount

Key: Netbt\Parameters Value Type: REG_DWORD - Count Valid Range: 0 - 0xFFFF Default: 3 Description: This value determines the number of times NetBT sends a query to a WINS server for a specified name without receiving a response.


NameSrvQueryTimeout

Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 100 - 0xFFFFFFFF Default: 1500 (1.5 seconds) Description: This value determines the time interval between successive name queries to WINS for a particular name.


SessionKeepAlive

Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 60,000 - 0xFFFFFFFF Default: 3,600,000 (1 hour) Description: This value determines the time interval between keepalive transmissions on a session.Setting the value to 0xFFFFFFF disables keepalives.


Size/Small/Medium/Large

Key: Netbt\Parameters Value Type: REG_DWORD Valid Range: 1, 2, 3 (Small, Medium, Large) Default: 1 (Small) Description: This value determines the size of the name tables that are used to store local and remote names.Generally, Small is adequate.If the computer is acting as a proxy name server, the value is automatically set to Large to increase the size of the name cache hash table.Hash table buckets are sized as follows: Large: 256 Medium: 128 Small: 16


Optional Parameters Configurable from Registry Editor


These parameters generally do not exist in the registry.They may be created to modify the default behavior of the NetBT protocol driver.

BroadcastAddress

Key: Netbt\Parameters Value Type: REG_DWORD - Four byte, little- endian encoded IP address Valid Range: 0 - 0xFFFFFFFF Default: The ones-broadcast address for each network. Description: This parameter can be used to force NetBT to use a specific address for all broadcast name-related packets.By default, NetBT uses the ones-broadcast address that is appropriate for each net (that is, for a network of 11.101.0.0 with a subnet mask of 255.255.0.0, the subnet broadcast address would be 11.101.255.255).This parameter would be set, for example, if the network uses the zeros-broadcast address (set by using the UseZeroBroadcast TCP/IP parameter).The appropriate subnet broadcast address would then be 11.101.0.0 in the earlier example.This parameter would then be set to 0x0b650000.This parameter is global and is used on all subnets that NetBT is bound to.


EnableProxyRegCheck

Key: Netbt\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: If this parameter is set to 1 (True), the proxy name server sends a negative response to a broadcast name registration if the name is already registered with WINS or is in the proxy's local name cache with a different IP address.The hazard of enabling this feature is that it prevents a computer from changing its IP address as long as WINS has a mapping for the name.Therefore, it is disabled by default.


InitialRefreshT.O.

Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 960000 - 0xFFFFFFF Default: 960000 (16 minutes) Description: This parameter specifies the initial update timeout used by NBT during name registration.NBT tries to contact the WINS servers at 1/8th of this time interval when it is first registering names.When it receives a successful registration response, that response contains the new update interval to use.


LmhostsTimeout

Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 1000 - 0xFFFFFFFF Default: 6000 (6 seconds) Description: This parameter specifies the timeout value for LMHOSTS and DNS name queries.The timer has a granularity of the timeout value.Therefore, the actual timeout might be as much as two times the value.


MaxDgramBuffering

Key: Netbt\Parameters Value Type: REG_DWORD - Count of bytes Valid Range: 0 - 0xFFFFFFFF Default: 0x20000 (128 Kb) Description: This parameter specifies the maximum memory that NetBT dynamically allocates for all outstanding datagram sends.After this limit is reached, additional sends will fail because the available resources are not sufficient resources.


NodeType

Key: Netbt\Parameters Value Type: REG_DWORD - Number Valid Range: 1,2,4,8 (B-node, P-node, M-node, H-node) Default: 1 or 8 based on the WINS server configuration Description: This parameter determines what methods NetBT uses to register and resolve names.A B-node computer uses broadcasts.A P-node computer uses only point- to-point name queries to a name server (WINS).An M-node computer broadcasts first, and then queries the name server.An H-node computer queries the name server first, and then broadcasts.Resolution through LMHOSTS or DNS follows these methods.If this key is present, it will override the DhcpNodeType key.If neither key is present, the computer uses B-node if there are no WINS servers configured for the network.The computer uses H-node if there is at least one WINS server configured.


RandomAdapter

Key: Netbt\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: This parameter applies to a multihomed host only.If it is set to 1 (True), NetBT will randomly select the IP address to put in a name query response from all its bound interfaces.Frequently, the response contains the address of the interface that the query arrived on.This feature would be used by a server with two interfaces on the same network for load balancing.


RefreshOpCode

Key: Netbt\Parameters Value Type: REG_DWORD - Number Valid Range: 8, 9 Default: 8 Description: This parameter forces NetBT to use a specific opcode in name update packets.The specification for the NetBT protocol is somewhat ambiguous in this area.Although the default of 8 that is used by Microsoft implementations appears to be the intended value, some other implementations, such as those by Ungermann-Bass, use the value 9.Two implementations must use the same opcode to interoperate.


SingleResponse

Key: Netbt\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: This parameter applies to a multihomed host only.If this parameter is set to 1 (True), NBT will only supply an IP address from one of its bound interfaces in name query responses.By default, the addresses of all bound interfaces are included.


WinsDownTimeout

Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 1000 - 0xFFFFFFFF Default: 15,000 ( 15 seconds) Description: This parameter determines the time that NBT waits before again trying to use WINS after it does not contact any WINS server.With this feature, computers that are temporarily disconnected from the network can proceed through boot processing without waiting to time out each WINS name registration or query individually.


Parameters Configurable from the Connection Properties


These parameters can be set through the Connection Properties from the Network Connections folder.You do not have to configure them directly.

EnableDns

Key: Netbt\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: If this value is set to 1 (True), NBT queries the DNS for names that cannot be resolved by WINS, broadcast, or the LMHOSTS file.


EnableLmhosts

Key: Netbt\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 1 (True) Description: If this value is set to 1 (True), NBT searches the LMHOSTS file, if it exists, for names that cannot be resolved by WINS or broadcast.By default, there is no LMHOSTS file database directory (specified by Tcpip\Parameters\DatabasePath).Therefore, NBT takes no action.This value is written by the Advanced TCP/IP configuration under the Network tool in Control Panel.


EnableProxy

Key: Netbt\Parameters Value Type: REG_DWORD - Boolean Valid Range: 0 or 1 (False or True) Default: 0 (False) Description: If this value is set to 1 (True), the computer acts as a proxy name server for the networks that NBT is bound to.A proxy name server answers broadcast queries for names that it has resolved through WINS.With a proxy name server, a network of B-node implementations can connect to servers on other subnets that are registered with WINS.


NameServer

Key: Netbt\Parameters\Interfaces\Tcpip_ID for Adapter Value Type: REG_SZ - Dotted decimal IP address (for example,11.101.1.200) Valid Range: Any valid IP address Default: blank ( no address ) Description: This parameter specifies the IP address of the primary WINS server.If this parameter contains a valid value, it overrides the DHCP parameter of the same name.


NameServerBackup

Key: Netbt\Parameters\Interfaces\Tcpip_ID for Adapter Value Type: REG_SZ - Dotted decimal IP address (for example, 11.101.1.200) Valid Range: Any valid IP address. Default: blank ( no address ) Description: This parameter specifies the IP address of the backup WINS server.If this parameter contains a valid value, it overrides the DHCP parameter of the same name.


ScopeId

Key: Netbt\Parameters Value Type: REG_SZ - Character string Valid Range: Any valid DNS domain name consisting of two dot-separated parts, or a "*". Default: None Description: This parameter specifies the NetBIOS name scope for the node.This value must not start with a period.If this parameter contains a valid value, it will override the DHCP parameter of the same name.A blank value (empty string) will be ignored.Setting this parameter to the value "*" indicates a null scope and will override the DHCP parameter.


Non-configurable parameters


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

DhcpNameServer

Key: Netbt\Parameters\Interfaces\Tcpip_ID for Adapter Value Type: REG_SZ - Dotted decimal IP address (for example, 11.101.1.200) Valid Range: Any valid IP address Default: None Description: This parameter specifies the IP address of the primary WINS server.It is written by the DHCP client service, if enabled.A valid NameServer value will override this parameter.


DhcpNameServerBackup

Key: Netbt\Parameters\Interfaces\Tcpip_ID for Adapter Value Type: REG_SZ - Dotted decimal IP address (for example, 11.101.1.200) Valid Range: Any valid IP address Default: None Description: This parameter specifies the IP address of the backup WINS server.It is written by the DHCP client service, if enabled.A valid BackupNameServer value will override this parameter.


DhcpNodeType

Key: Netbt\Parameters Value Type: REG_DWORD - Number Valid Range: 1 - 8 Default: 1 Description: This parameter specifies the NBT node type.It is written by the DHCP client service, if enabled.A valid NodeType value will override this parameter.See the entry for NodeType for a complete description.


DhcpScopeId

Key: Netbt\Parameters Value Type: REG_SZ - Character string Valid Range: a dot-separated name string such as "microsoft.com" Default: None Description: This parameter specifies the NetBIOS name scope for the node.It is written by the DHCP client service, if enabled.This value must not start with a period.See the entry for ScopeId for more information.


NbProvider

Key: Netbt\Parameters Value Type: REG_SZ - Character string Valid Range: _tcp Default: _tcp Description: This parameter is used internally by the RPC component.The default value should not be changed.


TransportBindName

Key: Netbt\Parameters Value Type: REG_SZ - Character string Valid Range: N/A Default: \Device\ Description: This parameter is used internally during product development.The default value should not be changed.