Microsoft KB Archive/103003

= REG: Network Services Entries, Part 7 =

Article ID: 103003

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1

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This article was previously published under Q103003



SUMMARY
The article contains Registry entries for network services, Part 7. These subgroups are included:

 Redirector (Rdr) Service  Remote Access Service (RAS)

    - RAS NetBIOSGateway Subkey - RAS AsyncMac Subkey - RAS RasHub Subkey - RAS RasMan Subkey 

For a listing of the contents of network services entries articles 1-8, see "Network Services Entries, Part 1."

Redirector (Rdr) Service Entries
The subkey for the Rdr (redirector) service has this Registry path:

  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Rdr\ Parameters

For the search buffer sizes defined in the following entries: if the buffer passed for the search is less than the LowerSearchThreshold value, the system requests LowerSearchThreshold bytes of data from the server. If the buffer size is between the value of LowerSearchThreshold and UpperSearchBufferSize, the system uses the buffer size. On a slow link (such as a RAS link), if it will take more than five seconds to retrieve data, the Redirector service uses the user's requested buffer size.

ConnectTimeout REG_DWORD Number of seconds   Specifies the maximum amount of time the redirector will wait for a   connect or disconnect to complete. Default: 300 (5 minutes)

LowerSearchBufferSize REG_DWORD Number of kilobytes   Specifies the number of bytes the redirector will use for small searches. Default: 16K

LowerSearchThreshold REG_DWORD Number of kilobytes   Specifies the number of bytes below which the redirector will request a search of LowerSearchBufferSize. If the search size is  larger than this (but below the UpperSearchBufferSize), the redirector will use the UpperSearchBufferSize. Default: 16K

StackSize REG_DWORD Number of kilobytes   Sets the default IRP stack size for the redirector. Default: 4

UpperSearchBufferSize REG_DWORD Number of kilobytes   Specifies the number of bytes the redirector will use for large searches. Default: 32K

UseAsyncWriteBehind REG_DWORD 0 or 1   Enables the asynchronous-write-behind variation of the write-behind optimization. Default: 1 (true)

UseWriteBehind REG_DWORD 0 or 1 <pre class="fixed_text">  Enables the write-behind optimization. Default: 1 (true)

Remote Access Service (RAS) Entries
The RemoteAccess subkey is created in the Registry when you install RAS on a server, using the Network icon in Control Panel. The default values in RemoteAccess and its subkeys work well for all Windows NT operations such as copying files, using network resources, and sending and receiving electronic mail. However, for some systems, you may want to adjust individual parameters to suit your particular performance and security needs.

Initially, there are no value entries in the Registry for the Remote Access key or its subkeys until you add them with new settings. (The only exception is EnableNetbiosGateway, the NetBIOS parameter.) Unlisted value entries are set to their default values, as described in this section.

For information on Remote Access configuration files and other parameters, see Appendix B, "Configuration Files," in the "Windows NT Remote Access Service Administrator's Guide."

See also WanNameQueryRetries in "NBF (NetBEUI) Transport Entries," in the article "Network Services Entries, Part 4."

Remote Access Parameters Subkey Entries
The Parameters subkey for Remote Access has the following Registry path:

<pre class="fixed_text">  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \RemoteAccess\Parameters

For changes to take effect, you must stop and restart the Remote Access service. The functions and settings of these value entries are as follows:

AuthenticateRetries REG_DWORD 0 to 10 <pre class="fixed_text">  Sets the maximum number of unsuccessful retries allowed if the initial attempt at authentication fails. Default: 2

AuthenticateTime REG_DWORD 20 to 600 seconds <pre class="fixed_text">  Sets the maximum time limit within which a user must be   successfully authenticated. If the client does not initiate the authentication process within this time, the user is disconnected. Default: 120 seconds

CallbackTime REG_DWORD 2 to 12 seconds <pre class="fixed_text">  Sets the time interval that the server waits before calling the client back when the Callback feature has been set. Each client communicates the value of its own callback time when connecting to  a Remote Access server. If this value is not communicated (that is,  if the client does not communicate a value for the callback time,   as with Remote Access 1.0 and 1.1 clients), the value of the CallbackTime parameter becomes the default. Default: 2 seconds

EnableAudit REG_DWORD 0 or 1 <pre class="fixed_text">  Determines whether Remote Access auditing is turned on or off. If  this feature is enabled, all audits are recorded in the Security event log, which you can view using Event Viewer. Default: 1 (enabled)

NetbiosGatewayEnabled REG_DWORD 0 or 1 <pre class="fixed_text">  CAUTION: Do not change this value in Registry Editor, because various network bindings must also be changed. This parameter should be changed only by using the RAS Setup program.

<pre class="fixed_text">  Makes the server function like a NetBIOS gateway, allowing clients to access the LAN. If disabled, remote clients can access only the resources on the Remote Access server in a point-to-point connection; dial-in users cannot see the network or access network resources. Default: 1 (enabled)

RAS NetBIOSGateway Subkey Entries
The Registry path for these entries is the following:

<pre class="fixed_text">  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services

\RemoteAccess\Parameters\NetbiosGateway

AutoDisconnect REG_DWORD 0 to 60000 seconds (1000 minutes) <pre class="fixed_text">  Sets the time interval after which inactive connections are terminated. Inactivity is measured by lack of NetBIOS session data transfer, such as copying files, accessing network resources, and sending and receiving electronic mail. You may want to set this value to 0 seconds if clients are running NetBIOS datagram applications. Setting this value to 0 turns off AutoDisconnect. Default: 1200 seconds (20 minutes)

DisableMcastFwdWhenSessionTraffic REG_DWORD 0 or 1 <pre class="fixed_text">  Allows NetBIOS session traffic (for example, Windows NT   applications) to have priority over multicast datagram (such as   server messages). In other words, multicast datagram are transferred only when there is no session traffic. Unless you're  using an application that depends on multicast datagram, leave this parameter enabled. Default: 1 (enabled)

EnableBroadcast REG_DWORD 0 or 1 <pre class="fixed_text">  Determines whether broadcast datagram are forwarded to remote workstations. Broadcast datagram are not often useful and take up  too much bandwidth on a slow link. Unless you're using an  application that relies on broadcast datagram, leave this parameter disabled. Default: 0 (disabled)

EnableNetBIOSSessionsAuditing REG_DWORD 0 or 1 <pre class="fixed_text">  Enable this parameter to record in the event log the establishment of NetBIOS sessions between the remote clients and the LAN servers. Enable this parameter to track the NetBIOS resources accessed on  the LAN. Default: 0 (disabled)

MaxBcastDgBuffered REG_DWORD 16 to 255 <pre class="fixed_text">  Sets the number of broadcast datagram that the gateway buffers for a client. If you're using an application that communicates extensively through multicast or broadcast datagram, increase this parameter so that the Remote Access server can deliver all datagram reliably. Default: 32

MaxDgBufferedPerGroupName REG_DWORD 1 to 255 <pre class="fixed_text">  Sets the number of datagram that can be buffered per group name. Increasing this value buffers more datagram per group name but also takes up more virtual memory. Default: 10

MaxDynMem REG_DWORD 131072 to 4294967295 <pre class="fixed_text">  Sets the amount of virtual memory used to buffer NetBIOS session data for each remote client. Because the Remote Access server is a  gateway between the slow line and the LAN, data is stored (buffered) in its memory when coming from the fast line (LAN) before it is forwarded to the slow line (asynchronous line).

<pre class="fixed_text">  The Remote Access server minimizes the usage of the system's   physical memory by locking only a minimal set of pages (about 64K   per client) and making use of virtual memory (up to MaxDynMem) to   buffer the rest of the data. So, as long as there is enough space on the hard disk to expand PAGEFILE.SYS, you can increase this value if needed.

<pre class="fixed_text">  If you have an application with a LAN (fast) sender and an   asynchronous (slow) receiver, and if the sender is sending more data at a time than the Remote Access server can buffer in  MaxDynMem, the Remote Access server tries to apply a form of   NetBIOS level flow control by not submitting NCB.RECEIVE on the session until it has enough buffer space to get incoming data. For this reason, if you have such an application, you should increase your NetBIOS SEND/RECEIVE timeouts so that the fast sender can keep pace with the slow receiver. Default: 655350

MaxNames REG_DWORD 1 to 255 <pre class="fixed_text">  Sets the number of unique NetBIOS names each client can have, with a limit of 255 names for all clients together. Remote clients running Windows NT and Windows for Workgroups may need as many as  seven or eight names each. To accommodate these workstations, set the MaxNames value to 8 and reduce the number of ports on the Remote Access server. If you have Windows NT or Windows for Workgroups clients dialing in to servers running Remote Access version 1.1 or earlier, set this parameter to 8 or greater. Default: 255

MaxSessions REG_DWORD 1 to 255 <pre class="fixed_text">  Sets the maximum number of simultaneous NetBIOS sessions each client can have, with a limit of 255 sessions for all clients together. If you have multiple clients connecting simultaneously with each running 4 or 5 sessions, decrease the value of this parameter so that the total number of sessions does not exceed 255. Default: 255

MultiCastForwardRate REG_DWORD -1 (disabled); 0 to 32,676 seconds <pre class="fixed_text">  Governs the multicasting of group name datagram to all remote workstations. This parameter filters datagram sent on group names by forwarding them at a specified time interval. The value -1 disables forwarding. The value 0 guarantees delivery of group name datagram. The value n forwards datagram every n seconds, when 1 is  less than or equal to n less than or equal to 32,676. If the EnableBroadcast parameter is set to 0, broadcasts are not forwarded even if the MultiCastForwardRate parameter is set to a positive number (in this case, only multicast datagram are forwarded). The line becomes overloaded. If MultiCastForwardRate is set to -1, broadcasts are still not forwarded even if EnableBroadcast is set to 1. See also EnableBroadcast.

<pre class="fixed_text">  To save bandwidth for session traffic, filter the datagram. However, if you have an application based on multicast datagram, set this parameter to 0. This value guarantees delivery of all datagram sent on group names from the LAN to the remote client. Default: 5

NumRecvQueryIndications REG_DWORD 1 to 32 <pre class="fixed_text">  Allows a Remote Access client to initiate multiple network connections simultaneously. If a remote client is running a NetBIOS application that does multiple NCB.CALL commands simultaneously, increase this parameter to improve performance. Default: 3

RcvDgSubmittedPerGroupName REG_DWORD 1 to 32 <pre class="fixed_text">  Determines the number of NetBIOS commands of the type Receive Datagram that can be submitted simultaneously per group name on the LAN stack. Keep this setting as small as possible to minimize the amount of memory consumed by system resources. Each datagram command received locks about 1.5K of physical memory in the system. Default: 3

RemoteListen REG_DWORD 0 to 2 <pre class="fixed_text">  Sets the remote NCB_LISTEN capability.

<pre class="fixed_text">  Value          Meaning --  0              Disables a client's ability to post NCB_LISTEN for any NetBIOS name. Because every remote listen posted consumes one session, setting this parameter to 0 saves sessions. <pre class="fixed_text">  1              Messages. Allows clients to post NCB_LISTEN on Windows NT Advanced Server message aliases only. If a remote client is running the Messenger service, it can then receive messages from LAN users, printers, and the like. <pre class="fixed_text">  2              All. Enables NCB_LISTEN for all remote client NetBIOS names, allowing clients to run NetBIOS server applications. This setting allows all clients to function as NetBIOS servers on the network.

<pre class="fixed_text">  It is best to leave the RemoteListen parameter set to the default, 1 (messages). Allowing NCB_LISTEN capability on remote clients can significantly drain system resources and therefore is not recommended.

<pre class="fixed_text">  If the RemoteListen parameter is set to 2, Remote Access posts an   NCB_LISTEN on all NetBIOS names of Remote Access clients. Because the average Windows NT Advanced Server workstation has about seven or eight NetBIOS names assigned to it, the total number of NetBIOS names for which an NCB_LISTEN would be posted is 7 or 8 * 64 (the  maximum number of clients per Remote Access server), which exceeds the 255 maximum. Default: 1 (messages)

SizWorkBufs REG_DWORD 1024 to 65536 <pre class="fixed_text">  Sets the size of work buffers. The default setting is optimized for the server message block (SMB) protocol, the protocol between the workstation and the server running on the Windows NT Advanced Server system. Default: 4500

RAS AsyncMAC Subkey Entries
The Registry path for these entries is the following:

<pre class="fixed_text">  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \AsyncMacn\Parameters

For changes to take effect, you must restart the computer.

MaxFrameSize REG_DWORD 576 to 1514 <pre class="fixed_text">  Determines the maximum frame size. Use smaller frames for noisy links. A lower setting sends less data per frame, slowing performance. Do not change this parameter for previous versions of  the Remote Access service. The value is negotiated between the server and Windows NT clients. Default: 1514

RAS RasHub Subkey Entries
The Registry path for the RasHub subkey is:

<pre class="fixed_text">  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasHub

\Parameters

For changes to take effect, you must restart the computer.

The subkeys RasHub01 and RasHub02 show, for example, that this installation of Remote Access is configured for two COM ports. In configuring ports, you can determine whether clients have access to the Remote Access server only (point-to-point connection) or to the network.

NetworkAddress REG_SZ " xxxxxx" <pre class="fixed_text">  Reassigns the first four bytes of the 6-byte IEEE address. For example, for the address "03-1F-2C-81-92-34" only the first four bytes are looked at.

<pre class="fixed_text">  Some applications depend on an IEEE adapter address being available. However, because the Remote Access Service uses modems (not real Ethernet adapters), it does not have an IEEE Ethernet address per se. This parameter lets you manually set an IEEE adapter address for Remote Access adapter bindings where applications demand it.

RAS RasMan Subkey Entries
The Registry path for the RasMan key is:

<pre class="fixed_text">  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan \Parameters

Logging REG_DWORD 0 or 1 <pre class="fixed_text">  Turns on information tracking for the modem using the DEVICE.LOG file. Set this value to 1 if you have modem problems that you cannot solve following documented procedures in the Microsoft Windows NT Remote Access Administrator's Guide. Logging begins the next time you dial in to connect through RAS (you do not need to  restart your computer for the DEVICE.LOG file to be created).

Reference(s):

"The Windows NT Resource Kit for Operating System Version 3.1." "Windows NT Remote Access Service Administrator's Guide"

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