ID: q103002
The information in this article applies to:
The article contains Registry entries for network services, Part 6. These subgroups are included:
- NWLink Entries for Microsoft Extensions or to Novell NetBIOS
- NWNBLink Entries for Novell NetBIOS Microsoft Extensions
- NWLink Entries for IPX/SPX: NWLink Parameters for the Network
Adapter Card
- NWLink Entries for IPX/SPS: Global IPX Parameters
NWLink is an implementation of the IPX/SPX protocols popular in NetWare networks. In addition, the module NWNBLink provides support for the Novell implementation of the NetBIOS protocol. With the Registry Editor, you can modify the following:
The NWLink keys do not appear in the Registry unless this service is installed using the Network icon in Control Panel. After the service is installed, not all entries appear by default in the Registry. If the entry is not there, the default value for that entry is used.
The Microsoft Extensions to Novell NetBIOS are included to enhance the performance of the traditional Novell NetBIOS protocol. NWNBLink can detect automatically whether it is talking to a Novell NetBIOS implementation that does not understand these extensions; in such a case, NWNBLink will fall back to the standard Novell NetBIOS protocol currently used in NetWare networks. However, significant performance gains can be realized if the extensions are used (for example, if the NetBIOS conversation occurs between two Windows NT computers).
The Registry path for these value entries is the following:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\NWNBLink\Parameters
AckDelayTime REG_DWORD 50 to 65535 milliseconds
Determines the value of the delayed acknowledgment timer. Default:
250 (no entry = default)
AckWindow REG_DWORD 0 to 65535 frames
Specifies the number of frames to receive before sending an
acknowledgment. The AckWindow entry is used as a clocking mechanism
on networks in which the sender is networked on a fast LAN, but the
receiver is networked on the other side utilizing a slower link. By
automatically forcing acknowledgments, the sender can keep sending
frames continually. If both the sender and receiver are located on
a fast link, you can set AckWindow to 0 to turn off sending an
acknowledgment to the sender. Alternatively, NWNBLink can be set to
dynamically determine whether to use the AckWindow parameter based
on the setting of AckWindowThreshold. Related parameter:
AckWindowThreshold. Default: 2 (no entry = default)
AckWindowThreshold REG_DWORD 0 to 65535 milliseconds
Specifies the threshold value for the round-trip time that defines
when AckWindow will be ignored. The round trip time is an estimate
of how long it takes for a frame to be sent and received from a
workstation. NWNBLink determines this estimate and uses it as a
basis for determining whether it is necessary to send automatic
acknowledgments. If AckWindowThreshold is set to 0, NWNBLink relies
on the AckWindow entry. Related parameters: AckWindow. Default:
500 (no entry = default)
EnablePiggyBackAck REG_DWORD 0 or 1
Allows the receiver to piggyback acknowledgments. Piggybacking
acknowledgments can occur when the receiver has detected the end of
a NetBIOS message. When the sender and receiver are not
participating in two-way NetBIOS traffic, you should set
EnablePiggyBackAck to 0. An example of one-way traffic is a stock
update application, where a server constantly sends NetBIOS
messages to clients but the client does not need to respond.
If EnablePiggyBackAck is set to 1 but there is no back traffic,
NWNBLink waits the number of milliseconds determined by
AckDelayTime before sending the acknowledgment, and then it turns
off support for piggybacking acknowledgments. If the workstation at
some point starts sending as well as receiving data, NWNBLink turns
support back on for piggybacking acknowledgments. Related
parameter: AckDelayTime. Default: 1 (true-enable piggybacking
acknowledgments; no entry = default)
Extensions REG_DWORD 0 or 1
Specifies whether to use NWNBLink extensions discussed in this
section. Default: 1 (true; no entry = default)
RcvWindowMax REG_DWORD 1 to 49152 frames
Specifies the maximum number of frames the receiver can receive at
one time. The value specified by RcvWindowMax is sent to the sender
during session initialization to give the sender an upper bound on
the number of frames that can be sent at one time. Related
parameters: AckDelayTime, AckWindow, AckWindowThreshold,
EnablePiggyBackAck, and RcvWindowMax. Default: 4 (no entry =
default)
The Registry path for these value entries is the following:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\NWNBLink\Parameters
BroadcastCount REG_DWORD 1 to 65535
Specifies the number of times to send a broadcast. If Internet is
set to 1, the BroadcastCount is doubled. Related parameter:
BroadcastTimeout. Default: 3 (no entry = default)
BroadcastTimeout REG_DWORD 1 to 65535 half-seconds
Specifies the time between sending find-name requests. This value
is not affected if Internet is set to 1. Related parameter:
BroadcastCount. Default: 1 (no entry = default)
ConnectionCount REG_DWORD 1 to 65535
Specifies the number of times to send a connection probe. A
connection probe is sent by the initiator of a session if a
connection could not be made to the remote computer. If Internet is
set to 1, the ConnectionCount is doubled. Related parameter:
ConnectionTimeout. Default: 5 (no entry = default)
ConnectionTimeout REG_DWORD 1 to 65535 half-seconds
Specifies the time between sending connection probes when
initiating a session. Default: 2 (no entry = default)
InitialRetransmissionTime REG_DWORD 1 to 65535 milliseconds
Specifies the initial value for the retransmission time. Related
parameter: RetransmitMax. Default: 500 (no entry = default)
Internet REG_DWORD 0 or 1
Specifies whether to change the packet type from 0x04 to 0x14
(Novell WAN broadcast). Default: 1 (true; no entry = default)
KeepAliveCount REG_DWORD 1 to 65535
Specifies the number of times to send a session-alive frame before
timing out if there is no response. Related parameter:
KeepAliveTimeout. Default: 8 (no entry = default)
KeepAliveTimeout REG_DWORD 1 to 65535 half-seconds
Specifies the time between sending session-alive frames. Related
parameter: KeepAliveCount. Default: 60 (no entry = default)
RetransmitMax REG_DWORD 1 to 65535
Specifies the maximum number of times the sender should retransmit
before assuming that something is wrong with the link. Related
parameter: InitialRetransmissionTime. Default: 8 (no entry =
default)
These parameters are specific for each binding of NWLink to a network adapter card. The Registry path for these value entries is the following:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
\NWLinkIPX\NetConfig\Driver01
AdapterName REG_DWORD Name
Specifies the name of the adapter that NWLink will use. This
parameter is set when you choose a network adapter card to bind
NWLink using the Network icon in Control Panel. In this release,
only one card is supported.
BindSap REG_DWORD Type field
Specifies the Ethertype if the frame format is Ethernet II. The
Ethertype field is only relevant if Ethernet II frames are to be
sent or received. You can choose the frame type using the Network
icon in Control Panel. For more information, see the explanation
for the PktType entry. Related parameter: PktType. Default: 8137
(in hex)
EnableFuncaddr REG_DWORD Boolean
When set to 1, this parameter specifies that the IPX functional
address will be enabled if this card is a Token Ring card. If this
value is 0, the IPX functional address will not be added. The IPX
functional address is C00000800000 (hex). Novell has been phasing
out use of this, but it is still in use in some places. It is up to
the application to take advantage of the IPX functional address. In
most instances, the broadcast address (FFFFFFFFFFFF hex) is used
instead. Default: 1 (true)
MaxPktSize REG_DWORD 0 to 65535
Specifies the maximum frame size the network adapter card should be
allowed to transmit. If this number is 0, NWLink will get this
information from the card driver. This parameter allows the
administrator to make the maximum transmit size for a card smaller
than the card driver allows. A scenario in which you might want to
change this entry is in an environment in which the network adapter
card on one side of a conversation is on a link that has a larger
frame size than the link on the other side of a conversation-for
example, if the sending station is linked to a 16 Mbps Token Ring
and the receiving station is linked to an Ethernet network.
Default: 0
NetworkNumber REG_DWORD Number
Specifies the network number (in hex) to be used for this adapter.
If this number is 0, the NWLink will get the network number from
the network as it is running. This parameter is set using the
Network icon in Control Panel. IPX network numbers are 4 bytes (8
hex characters) long. An example of an IPX network number is
AABBDDFF. You should not have to enter a specific value because
NWLink will determine it for you. Make sure to get the network
number for your IPX subnet from the network administrator if you
want to enter a specific number. Default: 0
PktType REG_DWORD 0, 1, 2, 3,or 4
NWLink supports Ethernet, Token Ring, FDDI, and Arcnet topologies.
The PktType parameter specifies the packet form to use. The valid
values are the following:
Value Packet Form
--------------------------
0 Ethernet_II
1 Ethernet_802.3
2 802.3
3 SNAP
4 Arcnet
If the adapter is an Ethernet adapter, choose between values 0
through 3. If the adapter is either a Token Ring or FDDI adapter,
choose between values 2 and 3. If you are using an Arcnet adapter,
choose value 4. If the adapter is a Token Ring or FDDI adapter,
values 0 and 1 will work the same as value 2. Related parameter:
BindSap. Default: 1 (802.3)
SourceRouteBcast REG_DWORD 0 or 1
Specifies the source route to be used when transmitting a packet to
the broadcast MAC (Media Access Control) address (FFFFFFFFFFF hex).
If this value is 0, the packet will be transmitted to the
single-route broadcast (0xC2, 0x70). If the value is 1, the packet
will be transmitted to the all-routes broadcast (0x82, 0x70).
Related parameters: SourceRouteDef, SourceRouting, and
SourceRouteMCast. Default: 0
SourceRouteDef REG_DWORD 0 or 1
Specifies the source route to be used when transmitting a package
to a unique MAC address that is not in the source routing table. If
the MAC address is in the source routing table, the route in the
table will be used. If this value is 0, the packet will be
transmitted to the single-route broadcast (0xC2, 0x70). If the
value is not 0, the packet will be transmitted to the all-routes
broadcast (0x82, 0x70). Related parameters: SourceRouteBcast,
SourceRouting, and SourceRouteMCast. Default: 0
SourceRouteMcast REG_DWORD Boolean
Specifies the source route to be used when transmitting a packet to
a multicast MAC address (C000xxxxxxxx). If this value is 0, the
packet will be transmitted to the single-route broadcast (0xC2,
0x70). If the value is not 0, the packet will be transmitted to the
all-routes broadcast (0x82, 0x70). Related parameters:
SourceRouteBcast, SourceRouteDef, and SourceRouting. Default: 0
SourceRouting REG_DWORD Boolean
Specifies whether to use source routing. This parameter is only
used if the adapter is a Token Ring adapter. If there are no source
routing bridges on the Token Ring, disable this entry to disable
all of the source routing logic. Related parameters:
SourceRouteBcast, SourceRouteDef, and SourceRouteMCast. Default: 0
(false-do not use source routing)
The following parameters are global for the entire transport. The Registry path for these value entries is:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\NWLinkIPX\Parameters
ConnectionCount REG_DWORD 1 to 65535
Specifies the number of times the probe will be sent when SPX is
trying to connect to a remote node. If no response is received
after the probes are sent, an error will occur. Related parameter:
ConnectionTimeout. Default: 10
ConnectionTimeout REG_DWORD 1 to 65535 half-seconds
Specifies the time between connection probes when SPX is trying to
connect to a remote node. Related parameter: ConnectionCount.
Default: 2 (1 second)
KeepAliveCount REG_DWORD 1 to 65535
Specifies how many times to send a keep-alive probe before timing
out if there is no response. Related parameter: KeepAliveTimeout.
Default: 8
KeepAliveTimeout REG_DWORD 1 to 65535 half-seconds
Specifies the time that the local side should wait before sending a
probe to the remote to verify that the SPX connection is still
alive. Related parameter: KeepAliveCount. Default: 12 (6 seconds)
RipAgeTime REG_DWORD 1 to 65535 minutes
IPX maintains an RIP cache in order to locate computers on a remote
network. The RipAgeTime entry informs IPX how long to wait before
requesting an RIP update for an entry. This timer is reset when an
RIP announcement is received for an entry in the RIP cache.
Default: 5 minutes
RipCount REG_DWORD 1 to 65535
When the RIP protocol layer is trying to find a route on the
network, this parameter specifies how many times to send a request
before giving up. Related parameter: RipTimeout Default: 5
RipTimeout REG_DWORD 1 to 65535 half-seconds
Specifies the timeout between RIP request packets being sent out
when the RIP protocol layer is trying to find a route on the
network. Related parameter: RipCount. Default: 1 (1 half-second)
RipUsageTime REG_DWORD 1 to 65535 minutes
IPX maintains a RIP cache in order to locate computers on a remote
network. The RipUsageTime entry informs IPX how many minutes to
wait before an entry in the RIP cache will be deleted from the
cache. This timer is reset when a packet is sent to the remote
computer. Default: 15 minutes
SourceRouteUsageTime REG_DWORD 1 to 65535 minutes
Range: Specifies the number of minutes an unused entry can remain
in the Token Ring source routing cache before it is flushed.
Default: 10
WindowSize REG_DWORD 1 to 10 SPX packets
Specifies the window to use in the SPX packets. SPX uses the
Allocation field of the SPX packet to tell the remote how many
receives are available for receiving data. The WindowSize entry
specifies what value to put in the SPX Allocation field. Default: 4
Additional query words: prodnt
Keywords : kbother
Version : 3.1
Platform : WINDOWSLast Reviewed: August 14, 1998