# Configure the UDP Input

### QUESTION

How can the flow collector’s flow port be changed?

### ANSWER

The ElastiFlow Unified Flow Collector receives packets containing flow records using UDP. There are three configurable parameters:

| Parameter                                      | Description                                                                                                                                                    |
| ---------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| EF\_FLOW\_SERVER\_UDP\_PORT                    | The UDP port which the flow collector listens to for Netflow/IPFIX/sFLOW packets                                                                               |
| EF\_FLOW\_SERVER\_UDP\_IP                      | The IP address the UDP socket is bound to on the flow collector                                                                                                |
| EF\_FLOW\_SERVER\_UDP\_READ\_BUFFER\_MAX\_SIZE | The UDP receive buffer for the system. If this value exceeds the maximum allowed buffer size (`net.core.rmem_max` on Linux), the maximum allowed size is used. |

Refer to the Configuration Reference for additional details.

### REFERENCE

* Netflow/IPFIX/sFlow (UDP) Input
