Set-DnsServerResponseRateLimiting

Enables RRL on a DNS server.

Syntax

Set-DnsServerResponseRateLimiting
   [-ResponsesPerSec <UInt32>]
   [-ErrorsPerSec <UInt32>]
   [-WindowInSec <UInt32>]
   [-IPv4PrefixLength <UInt32>]
   [-IPv6PrefixLength <UInt32>]
   [-LeakRate <UInt32>]
   [-ResetToDefault]
   [-TruncateRate <UInt32>]
   [-MaximumResponsesPerWindow <UInt32>]
   [-Mode <String>]
   [-ComputerName <String>]
   [-PassThru]
   [-Force]
   [-CimSession <CimSession[]>]
   [-ThrottleLimit <Int32>]
   [-AsJob]
   [-WhatIf]
   [-Confirm]
   [<CommonParameters>]

Description

The Set-DnsServerResponseRateLimiting cmdlet enables Response Rate Limiting (RRL) on a Windows DNS server.

Examples

Example 1: Set RRL parameters on a DNS server

PS C:\> Set-DnsServerResponseRateLimiting -WindowInSec 7 -LeakRate 4 -TruncateRate 3 -ErrorsPerSec 8 -ResponsesPerSec 8

This command sets the RRL parameters on the DNS Server.

Example 2: Reset RRL settings to default values

PS C:\> Set-DnsServerResponseRateLimiting -ResetToDefault

This command resets all the RRL parameters on the DNS Server to default values.

Example 3: Set RRL to LogOnly mode

PS C:\> Set-DnsServerRRL -Mode LogOnly

This command sets the RRL on the DNS server to LogOnly mode.

Optional Parameters

-AsJob

Runs the cmdlet as a background job. Use this parameter to run commands that take a long time to complete.

The cmdlet immediately returns an object that represents the job and then displays the command prompt. You can continue to work in the session while the job completes. To manage the job, use the *-Job cmdlets. To get the job results, use the Receive-Job cmdlet.

For more information about Windows PowerShell background jobs, see about_Jobs.

Type:SwitchParameter
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-CimSession

Runs the cmdlet in a remote session or on a remote computer. Enter a computer name or a session object, such as the output of a New-CimSession or Get-CimSession cmdlet. The default is the current session on the local computer.

Type:CimSession[]
Aliases:Session
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-ComputerName

Specifies a remote DNS server. You can specify an IP address or any value that resolves to an IP address, such as a fully qualified domain name (FQDN), host name, or NetBIOS name.

Type:String
Aliases:Cn
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-Confirm

Prompts you for confirmation before running the cmdlet.

Type:SwitchParameter
Aliases:cf
Position:Named
Default value:False
Accept pipeline input:False
Accept wildcard characters:False
-ErrorsPerSec

Specifies the maximum number of times that the server can send an error response to a client within a one-second interval. The error responses include: REFUSED, FORMERR and SERVFAIL

Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-Force

Forces the command to run without asking for user confirmation.

Type:SwitchParameter
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-IPv4PrefixLength

Specifies the IPv4 prefix length, which indicates the size of the subnet in which the incoming queries are grouped. The server applies RRL if queries resulting in the same response occur more frequently than expected in a specified time window. The default value of this parameter is 24.

Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-IPv6PrefixLength

Specifies the IPv6 prefix length, which indicates the size of the IPv6 subnet in which the incoming queries are grouped. The server applies RRL if queries resulting in the same response occur more frequently than expected in a specified time window. The default value of this parameter is 56.

Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-LeakRate

Specifies the rate at which the server responds to dropped queries. For queries that meet criteria to be dropped due to RRL, the DNS server still responds once per LeakRate queries. For example, if LeakRate is 3, the server responds to one in every 3 queries. The allowed range for LeakRate is 2 to 10. If LeakRate is set to zero, then no responses are 'leaked' by RRL. LeakRate leaves a chance for the victims in the same subnet as the forged IP address to get responses to their valid queries. The default value for LeakRate is 3.

Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-MaximumResponsesPerWindow
Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-Mode

Specifies the state of RRL on the DNS server. The acceptable values for this parameter are: Enable, or Disable, or LogOnly. If the mode is set to LogOnly the DNS server performs all the RRL calculations but instead of taking the preventive actions (dropping or truncating responses), it only logs the potential actions as if RRL were enabled and continues with the normal responses. The default value is Enable.

Type:String
Parameter Sets:LogOnly, Enable, Disable
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-PassThru

Returns an object representing the item with which you are working. By default, this cmdlet does not generate any output.

Type:SwitchParameter
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-ResetToDefault

Indicates that this cmdlet sets all the RRL settings to their default values.

Type:SwitchParameter
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-ResponsesPerSec

Specifies the maximum number of times that the server sends a client the same response within a one-second interval.

Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-ThrottleLimit

Specifies 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 Windows 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.

Type:Int32
Position:Named
Default value:None
Accept pipeline input:False
Accept wildcard characters:False
-TruncateRate

Specifies the rate at which the server responds with truncated responses. For queries that meet the criteria to be dropped due to RRL, the DNS server still responds with truncated responses once per TruncateRate queries. For example, if TruncateRate is 2, one in every 2 queries receives a truncated response. The TruncateRate parameter provides the valid clients a way to reconnect using TCP. The allowed range for TruncateRate is 2 to 10. If it is set to 0, then this behaviour is disabled. The default value is 2.

Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False
-WhatIf

Shows what would happen if the cmdlet runs. The cmdlet is not run.

Type:SwitchParameter
Aliases:wi
Position:Named
Default value:False
Accept pipeline input:False
Accept wildcard characters:False
-WindowInSec

Specifies the period (in seconds) over which rates are measured and averaged for RRL. RRL is applied if queries from same subnet, resulting in same response, occur more frequently than expected in a specified time window. The default value is 5.

Type:UInt32
Position:Named
Default value:None
Accept pipeline input:True (ByPropertyName)
Accept wildcard characters:False

Outputs

Microsoft.Management.Infrastructure.CimInstance#DnsServerResponseRateLimiting

The Microsoft.Management.Infrastructure.CimInstance object is a wrapper class that displays Windows Management Instrumentation (WMI) objects. The path after the pound sign (#) provides the namespace and class name for the underlying WMI object.