Windows TCP/IP Registry Entries (158474)
The information in this article applies to:
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows 98 Second Edition
- Microsoft Windows Millennium Edition
This article was previously published under Q158474 IMPORTANT: This article contains information about modifying the registry. Before you
modify the registry, make sure to back it up and make sure that you understand how to restore
the registry if a problem occurs. For information about how to back up, restore, and edit the
registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
SUMMARY
This article documents the registry entries for the TCP/IP
protocol in the versions of Windows that are listed at the beginning of this article. For information about TCP/IP registry entries in Windows 2000, see the Microsoft Windows 2000 TCP/IP Implementation Details white paper at the following Microsoft Web site:
MORE INFORMATIONWARNING: If you use Registry Editor incorrectly, you may cause serious problems that may
require you to reinstall your operating system. Microsoft cannot guarantee that you can solve
problems that result from using Registry Editor incorrectly. Use Registry Editor at your own
risk.
The value entries that are described in this article do not normally exist in the Windows registry; they must be added to the following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP Values- BroadcastAddress = broadcast address in hexadecimal
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the address to use for NetBIOS name query broadcasts. The
default is based on the IP address and the subnet mask.
- BcastNameQueryCount = integer
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the number of times the system will retry NetBIOS name query
broadcasts. The default is 3. - BcastQueryTimeout = milliseconds
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the period of time the system will wait before timing out
broadcast name queries. The minimum value is 100. The default is 750. - BSDUrgent = 0 or 1
Data Type: DWORD
For Windows 98, the Data Type is a String value.
If this value is 1, it specifies that Microsoft TCP/IP is to treat
urgent data the way some UNIX systems do (with a maximum of 1 byte of
urgent data, for example). If this value is 0, it specifies that the
stack is to handle urgent data as specified by RFC 1122. The default is 1. - CacheTimeout = milliseconds
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies how long NetBIOS names are cached. The minimum is 60,000
milliseconds (1 minute). The default is 360,000 milliseconds (6 minutes). - DeadGWDetect = 0 or 1
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies whether Microsoft TCP/IP will use another gateway if the
current default gateway seems to be down. The default is 1. - DefaultRcvWindow = 16-bit number
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the default receive window advertised by TCP. The default is
8192. - DefaultTOS = 8-bit number
Data Type: DWORD
Specifies the default type of service (TOS) for IP packets initiated by
Microsoft TCP/IP. The default is 0. - DefaultTTL = 8-bit number
Data Type: String
Specifies the default time to live (TTL) for IP packets from Microsoft
TCP/IP. The default is 32. - DnsServerPort = port
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies which DNS server port to send queries to when resolving a name
using DNS. The default is 53. - EnableProxy = 0 or 1
Data Type: DWORD
For Windows 98, the Data Type is a String value.
If this value is 1, it specifies that this computer is a WINS proxy
agent. The default is 0. - IGMPLevel = 0, 1, or 2
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the level of support allowed for IP multicast, corresponding
to the levels in RFC 1112. The default is 2. - InitialRefreshT.O. = milliseconds
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the interval over which to contact WINS to refresh the name.
The minimum is 16 minutes, and the maximum is approximately 50 days
(0xFFFFFFFF). The default is 960,000 milliseconds (16 minutes). - KeepAliveTime = milliseconds
Data Type: DWORD
For Windows 98, the Data Type is a String Value.
Specifies the connection idle time in milliseconds before TCP will begin
sending keepalives, if keepalives are enabled on a connection. The
default is 2 hours (7,200,000). - KeepAliveInterval = 32-bit number
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the time in milliseconds between retransmissions of
keepalives, once the KeepAliveTime has expired. Once KeepAliveTime has
expired, keepalives are sent every KeepAliveInterval milliseconds until
a response is received, up to a maximum of MaxDataRetries before the
connection is terminated. The default is 1 second (1000). - LmhostsTimeout = milliseconds
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the period of time the system will wait before timing out when
seeking LMHOSTS for name resolution. The minimum value is 1000 (1
second). The default is 10,000 (10 seconds). - MaxConnections = 32-bit number
Data Type: String
Specifies the maximum number of concurrent connections. The default is 100. - MaxConnectRetries = Number
Data Type: String
Specifies the number of times a connection attempt (SYN) will be
retransmitted before giving up. The initial retransmission timeout is 3
seconds, and it is doubled each time up to a maximum of 2 minutes. The
default is 3. - MaxDataRetries = 32-bit number
Data Type: String
Specifies the maximum number of times a segment carrying data or an FIN
will be retransmitted before the connection is terminated. The
retransmission timeout itself is adaptive and will vary according to
link conditions. The default is 5. - NameServerPort = port
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the UDP port on the name server to which to send name queries
or registrations. The default is 137. - NameSrvQueryCount = integer
Data Type: String
Specifies the number of times the system will try to contact the WINS
server for NetBIOS name resolution. The default is 3. - NameSrvQueryTimeout = milliseconds
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies how long the system waits before timing out a name server
query. The minimum is 100. The default is 750. - NameTableSize = integer
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the maximum number of names in the NetBIOS name table. The
minimum allowable value is 1 and the maximum is 255. The default is 17. - NodeType = 1, 2, 4, or 8
Data Type: String
Specifies the mode of NetBIOS name resolution used by NetBIOS over
TCP/IP, where 1 = b-node, 2 = p-node, 4 = m-node, and 8 = h-node. This
value can be configured using DHCP. The default is 1 (b-node) if no
value is specified; if WINS servers are specified and NodeType is not,
the default is 8 (h-node). - PMTUBlackHoleDetect = 0 or 1
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies whether the stack will attempt to detect Maximum Transmission
Unit (MTU) routers that do not send back ICMP fragmentation-needed
messages. Setting this parameter when it is not needed can cause
performance degradation. The default is 0. - PMTUDiscovery = 0 or 1
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies whether Microsoft TCP/IP will attempt to perform path MTU
discovery as specified in RFC 1191. The default is 1. - PrioritizeRecordData 0 or 1
Data Type: DWORD NOTE: This value is not supported in Windows 95.
This parameter controls whether the Domain Name Resolver (DNR) sorts the addresses that are returned in response to a query for a multihomed host. By default, the DNR sorts addresses that are on the same subnet as one of the interfaces in the querying computer to the top of the list. This occurs so that a common-subnet (non-routed) IP address is given preference, when possible. The default value is 1. - RandomAdapter = 0 or 1
Data Type: DWORD
For Windows 98, the Data Type is a String value.
For a computer with multiple network adapters, specifies whether to
respond with an IP address selected randomly from the set of addresses
on the computer or whether to return the IP address of the adapter that
the request came in upon. The default is 0 (not random; that is, return
the address of the adapter that the request came in upon). - RoutingBufSize = 32-bit number
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the total amount of buffer space to allocate for routing
packets. This parameter is ignored if EnableRouting=0. The default is
73,216. - RoutingPackets = 32-bit number
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the maximum number of packets that can be routed
simultaneously. This parameter is ignored if EnableRouting=0. The
default is 50. - SessionKeepAlive = milliseconds
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies how often to send session keepalive packets on active
sessions. The minimum is 60 seconds. The default is 3600 seconds (1
hour). - SessionTableSize = integer
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies the maximum number of sessions in the NetBIOS session table.
The minimum allowable value is 1 and the maximum is 255. The default is
255. - SingleResponse = 0 or 1
Data Type: DWORD
For Windows 98, the Data Type is a String value.
For a computer with multiple network adapters, specifies whether to send
all IP addresses on a name query request from WINS. If this value is 1,
the system will send one address in a name query response; if 0, it will
return all the addresses of its adapters. The default is 0. - Size/Small/Medium/Large = 1, 2, or 3
Data Type: DWORD
For Windows 98, the Data Type is a String value.
Specifies how many buffers of various types to pre-allocate and the
maximum that can be allocated, where 1 = small, 2 = medium, and 3 =
large. The default is 1; the default is 3 if the WINS proxy is enabled. - Tcp1323Opts = 0, 1, 2 or 3
Data Type: DWORD
Controls RFC 1323 time stamps and window scaling options, where 0 = disable RFC 1323 options, 1 = window scale enabled only, 2 = time stamps enabled only, and 3 = both options enabled.
This section describes variables for subkeys that appear in the
following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP\ServiceProvider
The following keys describe the order used to resolve host names. A
lower number sets a higher priority for name resolution. These settings
are used for 16-bit Windows Sockets, which need to rely on the resolvers
that are expected to take the least time. The numbers indicate the
default values specified in Windows.
Note that the below values apply to Windows Sockets 1.1, and are not used if Windows Sockets 2.0 is installed (this is the default for Windows 98, and is an option for Windows 95).
LocalPriority = 499
HostsPriority = 500
DNSPriority = 2000
NetbtPriority = 2001
For additional information about this functionality, click the article number below
to view the article in the Microsoft Knowledge Base:
170619 Windows 95 ServiceProvider Priority Values Not Applied
The entries in this section must be added to the following registry key,
where n represents the particular TCP/IP-to-network adapter binding.
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Class\netTrans\000n
MaxMTU = 16-bit integer
Data Type: String
This specifies the maximum size datagram IP that can pass to a media driver. SNAP and source routing headers (if used on the media) are not included in this value. For example, on an Ethernet network, MaxMTU will default to 1500. The actual value used will be the minimum of the value
specified with this parameter and the size reported by the media driver.
The default is the size reported by the media driver.
For additional information about obtaining RFC documents, click the article number below
to view the article in the Microsoft Knowledge Base:
185262 How to Obtain Request for Comments Documents from the Internet
Modification Type: | Minor | Last Reviewed: | 12/16/2004 |
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Keywords: | kbenv kbinfo kbnetwork KB158474 |
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