VPN Throughputs Test

When users complain of slowness of the VPN sessions, administrators should first check the throughput of the VPN connections. Throughput reveals how well/badly the VPN tunnel processes network traffic. Low throughput is an indicator of bursty network traffic, which can cause users to experience slowness when interacting through the router. To receive real-time insights into the throughput of the VPN profiles, administrators can use the VPN Throughputs test. This test measures the throughput in real-time and alerts administrators if the throughput is low. Additionally, the test also reveals where the bottleneck is - during data reception/transmission?

For each WAN connection established based on the VPN profiles on the target router, this test reports the amount of data sent and received, the number of packets dropped during packet transmission and the time taken for data/packet transmission. The metrics reported by this test help administrators to identify the WAN connections through which the target router experienced more packet loss and transmission delay. Using this revelation, administrators can take remedial actions to alleviate the errors that caused the above-mentioned issues and enhance the user experience.

Target of the test : A Peplink WAN Router

Agent deploying the test : An external agent

Outputs of the test : One set of results for each VPN profile:WAN connection that is connected to the target router.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.

Host

The IP address of the host for which this test is to be configured.

SNMPPort

The port at which the monitored target exposes its SNMP MIB; The default value is 161.

SNMPVersion

By default, the eG agent supports SNMP version 1. Accordingly, the default selection in the SNMPversion list is v1. However, if a different SNMP framework is in use in your environment, say SNMP v2 or v3, then select the corresponding option from this list.

SNMPCommunity

The SNMP community name that the test uses to communicate with the target router. This parameter is specific to SNMP v1 and v2 only. Therefore, if the SNMPVersion chosen is v3, then this parameter will not appear.

UserName

This parameter appears only when v3 is selected as the SNMPVersion. SNMP version 3 (SNMPv3) is an extensible SNMP Framework which supplements the SNMPv2 Framework, by additionally supporting message security, access control, and remote SNMP configuration capabilities. To extract performance statistics from the MIB using the highly secure SNMP v3 protocol, the eG agent has to be configured with the required access privileges – in other words, the eG agent should connect to the MIB using the credentials of a user with access permissions to be MIB. Therefore, specify the name of such a user against this parameter. 

Context

This parameter appears only when v3 is selected as the SNMPVersion. An SNMP context is a collection of management information accessible by an SNMP entity. An item of management information may exist in more than one context and an SNMP entity potentially has access to many contexts. A context is identified by the SNMPEngineID value of the entity hosting the management information (also called a contextEngineID) and a context name that identifies the specific context (also called a contextName). If the Username provided is associated with a context name, then the eG agent will be able to poll the MIB and collect metrics only if it is configured with the context name as well. In such cases therefore, specify the context name of the Username in the Context text box.  By default, this parameter is set to none.

AuthPass

Specify the password that corresponds to the above-mentioned UserName. This parameter once again appears only if the SNMPversion selected is v3.

Confirm Password

Confirm the AuthPass by retyping it here.

AuthType

This parameter too appears only if v3 is selected as the SNMPVersion. From the AuthType list box, choose the authentication algorithm using which SNMP v3 converts the specified username and password into a 32-bit format to ensure security of SNMP transactions. You can choose between the following options:

  • MD5 – Message Digest Algorithm
  • SHA – Secure Hash Algorithm

EncryptFlag

This flag appears only when v3 is selected as the SNMPVersion. By default, the eG agent does not encrypt SNMP requests. Accordingly, the this flag is set to No by default. To ensure that SNMP requests sent by the eG agent are encrypted, select the Yes option. 

EncryptType

If this EncryptFlag is set to Yes, then you will have to mention the encryption type by selecting an option from the EncryptType list. SNMP v3 supports the following encryption types:

  • DES – Data Encryption Standard
  • AES – Advanced Encryption Standard

EncryptPassword

Specify the encryption password here.

Confirm Password

Confirm the encryption password by retyping it here.

Timeout

Specify the duration (in seconds) within which the SNMP query executed by this test should time out in this text box. The default is 10 seconds.

Data Over TCP

By default, in an IT environment, all data transmission occurs over UDP. Some environments however, may be specifically configured to offload a fraction of the data traffic – for instance, certain types of data traffic or traffic pertaining to specific components – to other protocols like TCP, so as to prevent UDP overloads. In such environments, you can instruct the eG agent to conduct the SNMP data traffic related to the monitored target over TCP (and not UDP). For this, set this flag to Yes. By default, this flag is set to No.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Transmitted data

Indicates the rate at which data was sent through this WAN connection during the last measurement period.

MB/sec

Compare the value of these measures across the WAN connections to figure out the WAN connection through which the maximum amount of data was transmitted/received.

Received data

Indicates the rate at which data was received through this WAN connection during the last measurement period.

MB/sec

Dropped packets

Indicates the number of packets dropped during packet transmission through this WAN connection.

Packets

A low value is desired for this measure.

Latency

Indicates the time taken by this WAN connection for data transmission.

Milliseconds

A low value is desired for this measure. Compare the value of this measure across the WAN connections to identify the slow WAN connection.