Bandwidth Configuration

Field	Description	Values	Default
Incoming Vlink ID	The ID of the vlink to apply to incoming transfers. Vlinks are a way to define aggregate transfer policies. For more information, see Controlling Bandwidth Usage with Virtual Links (GUI) or Controlling Bandwidth Usage with Virtual Links (Command Line).	Vlink IDs	`Undefined` (Disabled)
Incoming Target Rate Cap (Kbps)	The maximum target rate for incoming transfers, in kilobits per second. No transfer session can exceed this rate at any time. If the client requests an initial rate greater than the target rate cap, the transfer proceeds at the target rate cap. The default setting of `unlimited` applies no target rate cap.	positive integer	unlimited
Incoming Target Rate Default (Kbps)	The default initial rate for incoming transfers, in kilobits per second. If allowed ("Incoming Target Rate Lock" is set to `false`), clients can modify this rate in real time. This setting is not relevant to transfers with a `fixed` bandwidth policy.	positive integer	`10000`
Incoming Target Rate Lock	Lock the target rate of incoming transfers to the default value (set to `true`). Set to `false` to allow users to adjust the transfer rate of an incoming transfer up to the "Incoming Target Rate Cap".	`true` or `false`	`false`
Incoming Minimum Rate Cap (Kbps)	The highest minimum rate that an incoming transfer can request, in kilobits per second. Client minimum rate requests that exceed the minimum rate cap are ignored. The default value of `unlimited` applies no cap to the minimum rate. Important: Aspera strongly recommends setting the minimum rate cap to zero. Transfers do not slow below the client's requested minimum rate unless the minimum rate is capped on the server. If the client-requested minimum rate exceeds network or storage capacity, this can decrease transfer performance and cause problems on the target storage.	positive integer or `unlimited`	`unlimited`
Incoming Minimum Rate Default (Kbps)	The default initial minimum rate for incoming transfers, in kilobits per second. If allowed ("Incoming Minimum Rate Lock" is set to `false`), clients can modify the minimum rate in real time, up to the "Incoming Minimum Rate Cap". This setting is not relevant to transfers with a `fixed` bandwidth policy.	positive integer	`0`
Incoming Minimum Rate Lock	Lock the minimum rate of incoming transfers to the default value (set to `true`). Set to `false` to allow users to adjust the minimum transfer rate up to the "Incoming Minimum Rate Cap". This setting is not relevant to transfers with a `fixed` bandwidth policy. Important: Aspera strongly recommends setting a lock on minimum rate to prevent transfers from using minimum rates that can overwhelm network or storage capacity, decrease transfer performance, and cause problems on the target storage.	`true` or `false`	`false`
Incoming Bandwidth Policy Allowed	The bandwidth policies that incoming transfers can use. Aspera transfers can use high, fair, low, or fixed bandwidth policies to determine bandwidth allocation among transfers. `any` - The server does not deny any transfer based on policy setting. Note: Setting to `any` allows clients to request a `fixed` bandwidth policy. If the client also requests a high minimum transfer rate and that is not capped by the server, the transfer rate can exceed network or storage capacity. This can decrease transfer performance and cause problems on the target storage. To avoid these problems, set the allowed policy to `fair`. `high` - Transfers that use `high`, `fair`, or `low` bandwidth policies are allowed. Transfers that request `fixed` bandwidth policy are rejected. `fair` - Transfers that use `fair` or `low` bandwidth policies are allowed. Transfers that request `fixed` bandwidth policy are rejected. `low` - Only transfers that use a `low` bandwidth policy are allowed. All others are rejected.	`high`, `fair`, `low`, or `any`	`any`
Incoming Bandwidth Policy Default	The default bandwidth policy for incoming transfers. Clients can override the default policy if they specify a policy allowed by the server (see "Incoming Bandwidth Policy Allowed") and if "Incoming Bandwidth Policy Lock" is set to `false`. `high` - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, the transfer rate is twice as fast as a fair-policy transfer. The `high` policy requires maximum (target) and minimum transfer rates. `fair` - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, bandwidth is shared fairly by transferring at an even rate. The `fair` policy requires maximum (target) and minimum transfer rates. `low` - Adjust the transfer rate to use the available bandwidth up to the maximum rate. Similar to fair mode, but less aggressive when sharing bandwidth with other network traffic. When congestion occurs, the transfer rate is reduced to the minimum rate until other traffic decreases. `fixed` - Attempt to transfer at the specified target rate, regardless of network or storage capacity. This can decrease transfer performance and cause problems on the target storage. Aspera discourages using the `fixed` policy except in specific contexts, such as bandwidth testing. The `fixed` policy requires a maximum (target) rate.	`high`, `fair`, `low`, `fixed`	`fair`
Incoming Bandwidth Policy Lock	Lock the bandwidth policy of incoming transfer sessions to the default value (set to `true`). Set to `false` to allow users to adjust the bandwidth policy.	`true` or `false`	`false`
Incoming Rate Control Module	Set how the transmission rate should be managed relative to instantaneous network bandwidth availability. Aspera recommends that this option be changed only by advanced users. When the client does not specify a configuration, the server configuration is used. When the client specifies a value other than `delay` and the client is the receiver, then the client configuration overrides the server configuration. Values: delay: The baseline rate control module used by Aspera transfers. delay-odp: A queue-scaling controller for overdrive protection. delay-adv: An advanced rate controller. delay-laq: A loss-adjusted queueing (LAQ) rate controller. Note: The LAQ module is an experimental rate control module that is designed to solve issues with target rate overdrive, high concurrency (when many FASP sessions run at the same time), and shallow buffers (limited packet queuing capability of a router). When LAQ is set, then it uses the FD31 RTT predictor unless a different RTT predictor is explicitly set. To set a rate control module for outgoing traffic, set it from the command line (aspera.conf - Transfer Configuration).	`delay`, `delay-odp`, `delay-adv`, or `delay-laq`	`delay`
Incoming Traffic RTT Predictor	The type of predictor to use to compensate for feedback delay when measuring RTT. An experimental feature that might increase transfer rate stability and throughput by predicting network congestion. When set to `unset`, the client-specified predictor is used and if the client does not specify a predictor, then none is used. For more information, see Increasing Transfer Performance by Using an RTT Predictor.	`unset`, `none`, `alphabeta`, `fd31`, `bezier`, `ets`	`unset`
Incoming Rate Control Target Queue	The method for calculating the target queue. Static queuing is good for most internet connections, whereas dynamic queuing is good for satellite and other radio connections. For more information, see Increasing Transfer Performance by Using an RTT Predictor. When set to `unset`, the client-specified transfer queuing method is used and if the client does not specify a queuing method, then `static` is used.	`unset`, `static`, `dynamic`	`unset`
Outgoing Vlink ID	The ID of the vlink to apply to outgoing transfers. Vlinks are a way to define aggregate transfer policies. For more information, see Controlling Bandwidth Usage with Virtual Links (GUI) or Controlling Bandwidth Usage with Virtual Links (Command Line).	Vlink ID	`Undefined` (Disabled)
Outgoing Target Rate Cap (Kbps)	The maximum target rate for outgoing transfers, in kilobits per second. No transfer session can exceed this rate at any time. If the client requests an initial rate greater than the target rate cap, the transfer proceeds at the target rate cap. The default setting of `unlimited` applies no target rate cap.	positive integer	`unlimited`
Outgoing Target Rate Default (Kbps)	The default initial rate for outgoing transfers, in kilobits per second. If allowed ("Outgoing Target Rate Lock" is set to `false`), clients can modify this rate in real time up to the "Outgoing Target Rate Cap". This setting is not relevant to transfers with a `fixed` bandwidth policy.	positive integer	`10000`
Outgoing Target Rate Lock	Lock the target rate of outgoing transfers to the default value (set to `true`). Set to `false` to allow users to adjust the transfer rate of an outgoing transfer.	`true` or `false`	`false`
Outgoing Minimum Rate Cap (Kbps)	The highest minimum rate that an outgoing transfer can request, in kilobits per second. Client minimum rate requests that exceed the minimum rate cap are ignored. The default value of `unlimited` applies no cap to the minimum rate. Important: Aspera strongly recommends setting the minimum rate cap to zero. Transfers do not slow below the client's requested minimum rate unless the minimum rate is capped on the server. If the client-requested minimum rate exceeds network or storage capacity, this can decrease transfer performance and cause problems on the target storage.	positive integer	`unlimited`
Outgoing Minimum Rate Default	The default initial minimum rate for outgoing transfers, in kilobits per second. If allowed ("Outgoing Minimum Rate Lock" is set to `false`), clients can modify the minimum rate in real time up to the "Outgoing Minimum Rate Cap". This setting is not relevant to transfers with a `fixed` bandwidth policy.	positive integer	`0`
Outgoing Minimum Rate Lock	Lock the minimum rate of outgoing transfers to the default value (set to `true`). Set to `false` to allow users to adjust the minimum transfer rate. This setting is not relevant to transfers with a `fixed` bandwidth policy. Important: Aspera strongly recommends setting a lock on minimum rate to prevent transfers from using minimum rates that can overwhelm network or storage capacity, decrease transfer performance, and cause problems on the target storage.	`true` or `false`	`false`
Outgoing Bandwidth Policy Allowed	The bandwidth policies that outgoing transfers can use. Aspera transfers can use high, fair, low, or fixed bandwidth policies to determine bandwidth allocation among transfers. `any` - The server does not deny any transfer based on policy setting. Note: Setting to `any` allows clients to request a `fixed` bandwidth policy. If the client also requests a high minimum transfer rate and that is not capped by the server, the transfer rate can exceed network or storage capacity. This can decrease transfer performance and cause problems on the target storage. To avoid these problems, set the allowed policy to `fair`. `high` - Transfers that use `high`, `fair`, or `low` bandwidth policies are allowed. Transfers that request `fixed` bandwidth policy are rejected. `fair` - Transfers that use `fair` or `low` bandwidth policies are allowed. Transfers that request `fixed` bandwidth policy are rejected. `low` - Only transfers that use a `low` bandwidth policy are allowed. All others are rejected.	`high`, `fair`, `low`, or `any`	`any`
Outgoing Bandwidth Policy Default	The default bandwidth policy for outgoing transfers. Clients can override the default policy if they specify a policy allowed by the server (see "Outgoing Bandwidth Policy Allowed") and if "Outgoing Bandwidth Policy Lock" is set to `false`. `high` - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, the transfer rate is twice as fast as a fair-policy transfer. The `high` policy requires maximum (target) and minimum transfer rates. `fair` - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, bandwidth is shared fairly by transferring at an even rate. The `fair` policy requires maximum (target) and minimum transfer rates. `low` - Adjust the transfer rate to use the available bandwidth up to the maximum rate. Similar to fair mode, but less aggressive when sharing bandwidth with other network traffic. When congestion occurs, the transfer rate is reduced to the minimum rate until other traffic decreases. `fixed` - Attempt to transfer at the specified target rate, regardless of network or storage capacity. This can decrease transfer performance and cause problems on the target storage. Aspera discourages using the `fixed` policy except in specific contexts, such as bandwidth testing. The `fixed` policy requires a maximum (target) rate.	`high`, `fair`, `low`, `fixed`	`fair`
Outgoing Bandwidth Policy Lock	Lock the bandwidth policy of outgoing transfer sessions to the default value (set to `true`). Set to `false` to allow users to adjust the bandwidth policy.	`true` or `false`	`false`
Outgoing Traffic RTT Predictor	The type of predictor to use to compensate for feedback delay when measuring RTT. An experimental feature that might increase transfer rate stability and throughput by predicting network congestion. When set to `unset`, the client-specified predictor is used and if the client does not specify a predictor, then none is used. For more information, see Increasing Transfer Performance by Using an RTT Predictor.	`unset`, `none`, `alphabeta`, `fd31`, `bezier`, `ets`	`unset`
Outgoing Rate Control Target Queue	The method for calculating the target queue. Static queuing is good for most internet connections, whereas dynamic queuing is good for satellite and other radio connections. For more information, see Increasing Transfer Performance by Using an RTT Predictor. When set to `unset`, the client-specified transfer queuing method is used and if the client does not specify a queuing method, then `static` is used.	`unset`, `static`, `dynamic`	`unset`

Incoming Vlink ID

The ID of the vlink to apply to incoming transfers. Vlinks are a way to define aggregate transfer policies. For more information, see Controlling Bandwidth Usage with Virtual Links (GUI) or Controlling Bandwidth Usage with Virtual Links (Command Line).

Vlink IDs

Undefined (Disabled)

Incoming Target Rate Cap (Kbps)

The maximum target rate for incoming transfers, in kilobits per second. No transfer session can exceed this rate at any time. If the client requests an initial rate greater than the target rate cap, the transfer proceeds at the target rate cap. The default setting of unlimited applies no target rate cap.

positive integer

unlimited

Incoming Target Rate Default (Kbps)

The default initial rate for incoming transfers, in kilobits per second. If allowed ("Incoming Target Rate Lock" is set to false), clients can modify this rate in real time. This setting is not relevant to transfers with a fixed bandwidth policy.

positive integer

10000

Incoming Target Rate Lock

Lock the target rate of incoming transfers to the default value (set to true). Set to false to allow users to adjust the transfer rate of an incoming transfer up to the "Incoming Target Rate Cap".

true or false

false

Incoming Minimum Rate Cap (Kbps)

The highest minimum rate that an incoming transfer can request, in kilobits per second. Client minimum rate requests that exceed the minimum rate cap are ignored. The default value of unlimited applies no cap to the minimum rate.

Important: Aspera strongly recommends setting the minimum rate cap to zero. Transfers do not slow below the client's requested minimum rate unless the minimum rate is capped on the server. If the client-requested minimum rate exceeds network or storage capacity, this can decrease transfer performance and cause problems on the target storage.

positive integer or unlimited

unlimited

Incoming Minimum Rate Default (Kbps)

The default initial minimum rate for incoming transfers, in kilobits per second. If allowed ("Incoming Minimum Rate Lock" is set to false), clients can modify the minimum rate in real time, up to the "Incoming Minimum Rate Cap". This setting is not relevant to transfers with a fixed bandwidth policy.

positive integer

0

Incoming Minimum Rate Lock

Lock the minimum rate of incoming transfers to the default value (set to true). Set to false to allow users to adjust the minimum transfer rate up to the "Incoming Minimum Rate Cap". This setting is not relevant to transfers with a fixed bandwidth policy.

Important: Aspera strongly recommends setting a lock on minimum rate to prevent transfers from using minimum rates that can overwhelm network or storage capacity, decrease transfer performance, and cause problems on the target storage.

true or false

false

Incoming Bandwidth Policy Allowed

The bandwidth policies that incoming transfers can use. Aspera transfers can use high, fair, low, or fixed bandwidth policies to determine bandwidth allocation among transfers.

any - The server does not deny any transfer based on policy setting.
Note: Setting to any allows clients to request a fixed bandwidth policy. If the client also requests a high minimum transfer rate and that is not capped by the server, the transfer rate can exceed network or storage capacity. This can decrease transfer performance and cause problems on the target storage. To avoid these problems, set the allowed policy to fair.
high - Transfers that use high, fair, or low bandwidth policies are allowed. Transfers that request fixed bandwidth policy are rejected.
fair - Transfers that use fair or low bandwidth policies are allowed. Transfers that request fixed bandwidth policy are rejected.
low - Only transfers that use a low bandwidth policy are allowed. All others are rejected.

high, fair, low, or any

any

Incoming Bandwidth Policy Default

The default bandwidth policy for incoming transfers. Clients can override the default policy if they specify a policy allowed by the server (see "Incoming Bandwidth Policy Allowed") and if "Incoming Bandwidth Policy Lock" is set to false.

high - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, the transfer rate is twice as fast as a fair-policy transfer. The high policy requires maximum (target) and minimum transfer rates.
fair - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, bandwidth is shared fairly by transferring at an even rate. The fair policy requires maximum (target) and minimum transfer rates.
low - Adjust the transfer rate to use the available bandwidth up to the maximum rate. Similar to fair mode, but less aggressive when sharing bandwidth with other network traffic. When congestion occurs, the transfer rate is reduced to the minimum rate until other traffic decreases.
fixed - Attempt to transfer at the specified target rate, regardless of network or storage capacity. This can decrease transfer performance and cause problems on the target storage. Aspera discourages using the fixed policy except in specific contexts, such as bandwidth testing. The fixed policy requires a maximum (target) rate.

high, fair, low, fixed

fair

Incoming Bandwidth Policy Lock

Lock the bandwidth policy of incoming transfer sessions to the default value (set to true). Set to false to allow users to adjust the bandwidth policy.

true or false

false

Incoming Rate Control Module

Set how the transmission rate should be managed relative to instantaneous network bandwidth availability. Aspera recommends that this option be changed only by advanced users.

When the client does not specify a configuration, the server configuration is used. When the client specifies a value other than delay and the client is the receiver, then the client configuration overrides the server configuration.

Values:

delay: The baseline rate control module used by Aspera transfers.
delay-odp: A queue-scaling controller for overdrive protection.
delay-adv: An advanced rate controller.
delay-laq: A loss-adjusted queueing (LAQ) rate controller.
Note: The LAQ module is an experimental rate control module that is designed to solve issues with target rate overdrive, high concurrency (when many FASP sessions run at the same time), and shallow buffers (limited packet queuing capability of a router). When LAQ is set, then it uses the FD31 RTT predictor unless a different RTT predictor is explicitly set.

To set a rate control module for outgoing traffic, set it from the command line (aspera.conf - Transfer Configuration).

delay, delay-odp, delay-adv, or delay-laq

delay

Incoming Traffic RTT Predictor

The type of predictor to use to compensate for feedback delay when measuring RTT. An experimental feature that might increase transfer rate stability and throughput by predicting network congestion. When set to unset, the client-specified predictor is used and if the client does not specify a predictor, then none is used. For more information, see Increasing Transfer Performance by Using an RTT Predictor.

unset, none, alphabeta, fd31, bezier, ets

unset

Incoming Rate Control Target Queue

The method for calculating the target queue. Static queuing is good for most internet connections, whereas dynamic queuing is good for satellite and other radio connections. For more information, see Increasing Transfer Performance by Using an RTT Predictor. When set to unset, the client-specified transfer queuing method is used and if the client does not specify a queuing method, then static is used.

unset, static, dynamic

unset

Outgoing Vlink ID

The ID of the vlink to apply to outgoing transfers. Vlinks are a way to define aggregate transfer policies. For more information, see Controlling Bandwidth Usage with Virtual Links (GUI) or Controlling Bandwidth Usage with Virtual Links (Command Line).

Vlink ID

Undefined (Disabled)

Outgoing Target Rate Cap (Kbps)

The maximum target rate for outgoing transfers, in kilobits per second. No transfer session can exceed this rate at any time. If the client requests an initial rate greater than the target rate cap, the transfer proceeds at the target rate cap. The default setting of unlimited applies no target rate cap.

positive integer

unlimited

Outgoing Target Rate Default (Kbps)

The default initial rate for outgoing transfers, in kilobits per second. If allowed ("Outgoing Target Rate Lock" is set to false), clients can modify this rate in real time up to the "Outgoing Target Rate Cap". This setting is not relevant to transfers with a fixed bandwidth policy.

positive integer

10000

Outgoing Target Rate Lock

Lock the target rate of outgoing transfers to the default value (set to true). Set to false to allow users to adjust the transfer rate of an outgoing transfer.

true or false

false

Outgoing Minimum Rate Cap (Kbps)

The highest minimum rate that an outgoing transfer can request, in kilobits per second. Client minimum rate requests that exceed the minimum rate cap are ignored. The default value of unlimited applies no cap to the minimum rate.

Important: Aspera strongly recommends setting the minimum rate cap to zero. Transfers do not slow below the client's requested minimum rate unless the minimum rate is capped on the server. If the client-requested minimum rate exceeds network or storage capacity, this can decrease transfer performance and cause problems on the target storage.

positive integer

unlimited

Outgoing Minimum Rate Default

The default initial minimum rate for outgoing transfers, in kilobits per second. If allowed ("Outgoing Minimum Rate Lock" is set to false), clients can modify the minimum rate in real time up to the "Outgoing Minimum Rate Cap". This setting is not relevant to transfers with a fixed bandwidth policy.

positive integer

0

Outgoing Minimum Rate Lock

Lock the minimum rate of outgoing transfers to the default value (set to true). Set to false to allow users to adjust the minimum transfer rate. This setting is not relevant to transfers with a fixed bandwidth policy.

Important: Aspera strongly recommends setting a lock on minimum rate to prevent transfers from using minimum rates that can overwhelm network or storage capacity, decrease transfer performance, and cause problems on the target storage.

true or false

false

Outgoing Bandwidth Policy Allowed

The bandwidth policies that outgoing transfers can use. Aspera transfers can use high, fair, low, or fixed bandwidth policies to determine bandwidth allocation among transfers.

any - The server does not deny any transfer based on policy setting.
Note: Setting to any allows clients to request a fixed bandwidth policy. If the client also requests a high minimum transfer rate and that is not capped by the server, the transfer rate can exceed network or storage capacity. This can decrease transfer performance and cause problems on the target storage. To avoid these problems, set the allowed policy to fair.
high - Transfers that use high, fair, or low bandwidth policies are allowed. Transfers that request fixed bandwidth policy are rejected.
fair - Transfers that use fair or low bandwidth policies are allowed. Transfers that request fixed bandwidth policy are rejected.
low - Only transfers that use a low bandwidth policy are allowed. All others are rejected.

high, fair, low, or any

any

Outgoing Bandwidth Policy Default

The default bandwidth policy for outgoing transfers. Clients can override the default policy if they specify a policy allowed by the server (see "Outgoing Bandwidth Policy Allowed") and if "Outgoing Bandwidth Policy Lock" is set to false.

high - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, the transfer rate is twice as fast as a fair-policy transfer. The high policy requires maximum (target) and minimum transfer rates.
fair - Adjust the transfer rate to fully utilize the available bandwidth up to the maximum rate. When congestion occurs, bandwidth is shared fairly by transferring at an even rate. The fair policy requires maximum (target) and minimum transfer rates.
low - Adjust the transfer rate to use the available bandwidth up to the maximum rate. Similar to fair mode, but less aggressive when sharing bandwidth with other network traffic. When congestion occurs, the transfer rate is reduced to the minimum rate until other traffic decreases.
fixed - Attempt to transfer at the specified target rate, regardless of network or storage capacity. This can decrease transfer performance and cause problems on the target storage. Aspera discourages using the fixed policy except in specific contexts, such as bandwidth testing. The fixed policy requires a maximum (target) rate.

high, fair, low, fixed

fair

Outgoing Bandwidth Policy Lock

Lock the bandwidth policy of outgoing transfer sessions to the default value (set to true). Set to false to allow users to adjust the bandwidth policy.

true or false

false

Outgoing Traffic RTT Predictor

The type of predictor to use to compensate for feedback delay when measuring RTT. An experimental feature that might increase transfer rate stability and throughput by predicting network congestion. When set to unset, the client-specified predictor is used and if the client does not specify a predictor, then none is used. For more information, see Increasing Transfer Performance by Using an RTT Predictor.

unset, none, alphabeta, fd31, bezier, ets

unset

Outgoing Rate Control Target Queue

The method for calculating the target queue. Static queuing is good for most internet connections, whereas dynamic queuing is good for satellite and other radio connections. For more information, see Increasing Transfer Performance by Using an RTT Predictor. When set to unset, the client-specified transfer queuing method is used and if the client does not specify a queuing method, then static is used.

unset, static, dynamic

unset

Bandwidth Configuration

Bandwidth Settings Reference