JSI Tip 1217. Tuning the Windows NT Load Balancing Service via the registry.

Jerold Schulman

April 7, 1999

1 Min Read
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To tune/configure the WLBS, use regedt32 to navigate to:

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesWLBSParameters

Value Name

Type

RangeDefault

D e s c r i p t i o n

GUI

AliveMsgPeriod

REG_DWORD

 100 - 100001000 

 The milliseconds between "I am alive" status messages. 

 N 

AliveMsgTolerance

REG_DWORD

 5 - 100

 The number of periods to wait before a host is declared dead. 

 N 

ClusterName

REG_SZ

 Name of the WLBS cluster. 

 Y 

ClusterIPAddress

REG_SZ

 IP address of the cluster. 

 Y 

ClusterNetworkAddress

REG_SZ

MAC address of the cluster. 

 Y 

ClusterNetworkMask

REG_SZ

 Cluster network mask. 

 Y 

ClusterModeOnStart

REG_DWORD

 0 or 1

 Should WLBS start on boot up. 

 Y 

ConnectionCleanupDelay

REG_DWORD

 0 - 3600000300000 

 TCP connection cleanup delay (milliseconds) between cluster mode restarts. 

 N 

DedicatedIPAddress

REG_SZ

 IP address of the WLBS host's NIC

 Y 

DedicatedNetworkMask

REG_SZ

 Subnet mask of the WLBS host's NIC

 Y 

DescriptorsPerAlloc

REG_DWORD

 16 - 1024512 

 Number of connection descriptors allocated at a time. 

 N 

HostPriority

REG_DWORD

 1 - 32

 Host Priority. 

 Y 

IPToMACEnable

REG_DWORD

 0 or 1

 Enable automatic network address derivation from primary cluster IP address. 

 N 

LicenseKey

REG_SZ

 License key used by the WLBS cluster. 

 Y 

MaxDescriptorsAlloc

REG_DWORD

 1 - 512

 Maximum number of times connection descriptors can be allocated. 

 N 

MaskSourceMAC

REG_DWORD

 0 or 1

 A 1 masks source MAC in outbound packets, stopping switches from learning and forcing them to broadcast packets for unknown addresses to all ports. 

 N 

MulticastSupportEnable

REG_DWORD

 0 or 1

 Enables multicast mode. 

 N 

MulticastARPEnable

REG_DWORD

 0 or 1

 Enables ARPing from cluster IP to MAC in multicast mode. 

 N 

NBTSupportEnable

REG_DWORD

 0 or 1

 A 1 enables NBT cluster computer name support. 

 N 

RemoteControlEnabled

REG_DWORD

 0 or 1

 A 1 enables remote control. 

 N 

RemoteControlUDPPort

REG_DWORD

 1 - 655352504 

 Remote control UDP port for WLBS

 N 



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