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

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WLBS\Parameters

Value Name	Type	Range Default	D e s c r i p t i o n	GUI
AliveMsgPeriod	REG_DWORD	100 - 10000 1000	The milliseconds between "I am alive" status messages.	N
AliveMsgTolerance	REG_DWORD	5 - 100 5	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 0	Should WLBS start on boot up.	Y
ConnectionCleanupDelay	REG_DWORD	0 - 3600000 300000	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 - 1024 512	Number of connection descriptors allocated at a time.	N
HostPriority	REG_DWORD	1 - 32 1	Host Priority.	Y
IPToMACEnable	REG_DWORD	0 or 1 0	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 1	Maximum number of times connection descriptors can be allocated.	N
MaskSourceMAC	REG_DWORD	0 or 1 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 0	Enables multicast mode.	N
MulticastARPEnable	REG_DWORD	0 or 1 0	Enables ARPing from cluster IP to MAC in multicast mode.	N
NBTSupportEnable	REG_DWORD	0 or 1 1	A 1 enables NBT cluster computer name support.	N
RemoteControlEnabled	REG_DWORD	0 or 1 1	A 1 enables remote control.	N
RemoteControlUDPPort	REG_DWORD	1 - 65535 2504	Remote control UDP port for WLBS	N

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