Modify a TCP setting.
Syntax
Set-NetTCPSetting { [[-SettingName] String[]] | -InputObject CimInstance[] }
[-AutoReusePortRangeNumberOfPorts UInt16] [-AutoReusePortRangeStartPort UInt16]
[-AutoTuningLevelLocal AutoTuningLevelLocal] [-AutomaticUseCustom AutomaticUseCustom]
[-CimSession CimSession[]] [-CongestionProvider CongestionProvider] [-CwndRestart CwndRestart]
[-DelayedAckFrequency Byte] [-DelayedAckTimeoutMs UInt32] [-DynamicPortRangeStartPort UInt16]
[-DynamicPortRangeNumberOfPorts UInt16] [-EcnCapability EcnCapability] [-ForceWS ForceWS]
[-InitialCongestionWindowMss UInt32] [-InitialRtoMs UInt32] [-MaxSynRetransmissions Byte]
[-MemoryPressureProtection MemoryPressureProtection] [-MinRtoMs UInt32]
[-Timestamps Timestamps] [-ScalingHeuristics ScalingHeuristics]
[-NonSackRttResiliency NonSackRttResiliency] [-ThrottleLimit Int32] [-AsJob] [-PassThru]
[-Confirm] [-WhatIf] [CommonParameters]
Key
-AsJob
Run the cmdlet as a background job. Use this parameter to run commands that take a long time to complete.
-AutomaticUseCustom
Whether the automatic profile assigns a custom template, either Datacenter Custom or Internet Custom,
to a connection. The acceptable values for this parameter are: Enabled or Disabled.
-AutoReusePortRangeNumberOfPorts
The number of ports for the auto-reuse port range, which is a port range used for local ephemeral
port selection by outbound TCP connections for which either SO_REUSE_UNICASTPORT has been set on the socket,
or for which connect() has been called without calling bind() on the socket.
If you specify 0, the auto-reuse feature is disabled and ephemeral ports are drawn instead from the dynamic port range
as specified by DynamicPortRangeStartPort and DynamicPortRangeNumberOfPorts, even if SO_REUSE_UNICASTPORT is set on a socket.
-AutoReusePortRangeStartPort
The number of ports for the auto-reuse port range, which is a port range used for local ephemeral
port selection by outbound TCP connections for which either SO_REUSE_UNICASTPORT has been set on the socket,
or for which connect() has been called without calling bind() on the socket.
If you specify 0, the auto-reuse feature is disabled and ephemeral ports are drawn instead from the dynamic port range
as specified by DynamicPortRangeStartPort and DynamicPortRangeNumberOfPorts, even if SO_REUSE_UNICASTPORT is set on a socket.
-AutoTuningLevelLocal
A TCP auto-tuning level for the host computer.
TCP auto-tuning can improve throughput on high throughput, high latency networks.
Accepted values for this are:
• Disabled. Sets the TCP receive window to the default value.
• HighlyRestricted. Sets the TCP receive window to grow beyond the default value, but very conservatively.
• Restricted. Sets the TCP receive window to grow beyond the default value, but less conservatively than HighlyRestricted.
• Normal. Sets the TCP receive window to grow to accommodate almost all scenarios.
• Experimental. Sets the TCP receive window to grow to accommodate extreme scenarios.
-CimSession
Run the cmdlet in a remote session or on a remote computer.
Enter a computer name or a session object, such as the output of New-CimSession or Get-CimSession.
The default is the current session on the local computer.
-CongestionProvider
The congestion provider property that TCP uses.
The accepted values are:
• CTCP Compound TCP increases the receive window and amount of data sent.
CTCP can improve throughput on higher latency connections.
• DCTCP Data Center TCP adjusts the TCP window based on network congestion feedback based on
Explicit Congestion Notification (ECN) signaling.
DCTCP may improve throughput on low latency links.
• Default Servers use DCTCP by default.
Client computers use NewReno. For information about NewReno, see RFC 3782.
-CwndRestart
Whether to enable congestion window restart.
Congestion window restart can avoid slow start to optimize throughput on low latency networks.
For more information about congestion window restart, see RFC 2581.
The accepted values are:
• True TCP uses congestion window restart.
• False TCP uses the default setting of the connection.
-DelayedAckFrequency
The number of acknowledgments (ACKs) received before the computer sends a response.
-DelayedAckTimeoutMs
The time to wait, in milliseconds, before the computer sends an ACK if the computer
receives fewer than delayed acknowledgment frequency of packets.
Use the DelayedAckFrequency parameter to specify the delayed ACK frequency value.
Reducing the time to wait can increase throughput on low latency networks by accelerating growth
in TCP window size. The acceptable values for this parameter are: increments of 10, from 10 through 600.
-DynamicPortRangeNumberOfPorts
The number of ports for the dynamic port range that starts from the port that
you specify for the DynamicPortRangeStartPort parameter.
-DynamicPortRangeStartPort
The starting port for the dynamic port range.
This parameter sets the starting port to send and receive TCP traffic.
The acceptable values for this parameter are: 1 through 65535.
-EcnCapability
Whether to enable ECN capability.
The accepted values are:
• Enabled Use ECN capability.
• Disabled Do not use ECN capability.
If you specify a value of Disabled, UseECT0, or UseEct1 for the EcnMarking parameter of
the Set-NetIPInterface cmdlet, the current parameter has no effect.
-ForceWS
Whether to force window scaling for retransmission.
The accepted values are:
• Enabled Requires window scaling for retransmission.
• Disabled Does not require window scaling for retransmission. (default)
-InitialCongestionWindowMss
The initial size of the congestion window.
Provide a value to multiply by the maximum segment size (MSS).
The accepted values are: Even numbers from 2 through 64.
-InitialRtoMs
The period, in milliseconds, before connect, or SYN, retransmit.
The accepted values are: increments of 10, from 300 ms through 3000 ms.
-InputObject
The input object that is used in a pipeline command.
-MaxSynRetransmissions
The maximum number of times the computer sends SYN packets without receiving a response.
-MemoryPressureProtection
Whether to use memory pressure protection.
TCP memory pressure protection helps ensure that a computer continues normal operation when
low on memory due to denial of service attacks.
The accepted values are:
• Enabled When low on memory, during an attack, close existing TCP connections and drop incoming SYN requests.
• Disabled Do not use memory pressure protection.
• Default Use the computer default value for memory pressure protection.
-MinRtoMs
A value, in milliseconds, for the TCP retransmission to time out.
The accepted values are: increments of 10, from 20 ms through 300 ms.
-NonSackRttResiliency
Whether to enable round trip time resiliency for clients that do not support selective acknowledgment.
The accepted values are: Enabled or Disabled
-PassThru
Return an object representing the item with which you are working. By default, this cmdlet does not generate any output.
-ScalingHeuristics
Whether to enable scaling heuristics.
The accepted values are: Enabled or Disabled
-SettingName
An array of setting names. You can specify only 'Custom' for this parameter.
-ThrottleLimit
The maximum number of concurrent operations that can be established to run the cmdlet.
If this parameter is omitted or a value of 0 is entered, then PowerShell calculates an optimum throttle
limit for the cmdlet based on the number of CIM cmdlets that are running on the computer.
The throttle limit applies only to the current cmdlet, not to the session or to the computer.
-Timestamps
Whether to enable timestamps.
Timestamps facilitate round trip measurement, and can help protect against wrapped sequence numbers
on high throughput links. For more information about TCP timestamps, see RFC 1323.
The accepted values are: Enabled or Disabled
-Confirm
Prompt for confirmation before executing the command.
-WhatIf
Describe what would happen if you executed the command, without actually executing the command.
Standard Aliases for Set-NetTCPConnection: gs
The Set-NetTCPSetting cmdlet modifies a TCP setting. TCP settings are optimized for different network conditions including latency and congestion. To apply a TCP setting to a port number or destination IP address range, create a transport filter by using the New-NetTransportFilter cmdlet.
Change the custom TCP setting to have a value of 6 for the initial congestion window and use compound TCP:
PS C:\> Set-NetTCPSetting -SettingName "InternetCustom" -CongestionProvider CTCP -InitialCongestionWindowMss 6
“Trust is the most important part of a relationship, closely followed by communication. I think that if you have those two things, everything else falls into place - your affection, your emotional connection” ~ Vanessa Lachey
Get-NetTCPConnection - Get TCP connections.
Get-NetTransportFilter -
Get-NetUDPSetting -
New-NetTransportFilter -
Remove-NetTransportFilter -
Set-NetUDPSetting
Test-Connection - Ping one or more computers.
NETSTAT - Display current TCP/IP network connections and protocol statistics.