As of PRTG version 8.2, there is a jFlow sensor type which supports jFlow V5, as well as a jFlow v5 (Custom) Sensor.
The J-flow export of Juniper devices can be set to NetFlow 5 format which PRTG can process. This KB article on the Juniper website describes how to enable it:
Quote: Refer to the following steps for an example of configuring J-flow. It should also work with NetFlow versions 5 and 9.
http://kb.juniper.net/InfoCenter/index?page=content&id=KB16677
Important for users of PRTG 8.x (deprecated): J-flow usually uses sampling (i.e. only every n-th packet is being exported). PRTG's NetFlow and jFlow sensors do not support sampling yet, so you must either disable sampling on the Juniper device (which can affect performance due to increased processing load) or you must multiply the values shown by PRTG with the sampling rate. A sampling rate of 100 means that PRTG will show traffic to be 1 kbit/s while it actually is 100 kbit/s.
PRTG 9 or later supports sampling.
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