# Passive deployment for log ingestion behind a TAP/SPAN/diode

**URL:** <https://discuss.elastic.co/t/passive-deployment-for-log-ingestion-behind-a-tap-span-diode/219481>\
**Category:** Logstash\
**Created:** [February 15, 2020, 2:42pm UTC](https://discuss.elastic.co/t/passive-deployment-for-log-ingestion-behind-a-tap-span-diode/219481 "2020-02-15T14:42:50Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![m4rkus](https://avatars.discourse-cdn.com/v4/letter/m/ee7513/32.png) [@m4rkus](https://discuss.elastic.co/u/m4rkus)\
**Post date:** [February 15, 2020, 2:42pm UTC](https://discuss.elastic.co/t/passive-deployment-for-log-ingestion-behind-a-tap-span-diode/219481/1 "2020-02-15T14:42:50Z")

</div>

Hi,

I would like to setup an ELK stack for passive log ingestion behind a TAP/SPAN/diode, from an existing log stream. Unfortunately I haven't been able to find any information about passive deployment.

Can Logstash be configured to receive a UDP stream with logs in syslog, GELF or some other protocol with UDP support, on a network interface in promiscuous mode? Which option(s) would you suggest?

Thanks!

---

<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:** [March 14, 2020, 2:43pm UTC](https://discuss.elastic.co/t/passive-deployment-for-log-ingestion-behind-a-tap-span-diode/219481/2 "2020-03-14T14:43:06Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.