# Filebeat.netflow parse NAT log

**URL:** https://discuss.elastic.co/t/filebeat-netflow-parse-nat-log/355887
**Category:** Beats
**Tags:** filebeat
**Created:** [March 21, 2024, 9:55am UTC](https://discuss.elastic.co/t/filebeat-netflow-parse-nat-log/355887 "2024-03-21T09:55:20Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![shandian](https://avatars.discourse-cdn.com/v4/letter/s/a6a055/32.png) [@shandian](https://discuss.elastic.co/u/shandian)
#### Post date: [March 21, 2024, 9:55am UTC](https://discuss.elastic.co/t/filebeat-netflow-parse-nat-log/355887/1 "2024-03-21T09:55:20Z")

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Hello, I am using the netflow input of filebeat to parse data from NAT log. Fields in the NAT log are different from CISCO's netflow 9, so I use ''custom\_definitions''. However, filebeat encountered an error with the message ‘netflow protocol version 772 not supported’.

I also use udp input to receive data. '\ufffd' appears in the received data and I suspect there is a problem with the data received in this way.

 ![图片](https://us1.discourse-cdn.com/elastic/original/3X/6/c/6cd68ce7571f7965db6128a05386628392342c2d.png)

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<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 18, 2024, 11:55am UTC](https://discuss.elastic.co/t/filebeat-netflow-parse-nat-log/355887/2 "2024-04-18T11:55:35Z")

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