# Error when trying to use netmap

**URL:** <https://community.zeek.org/t/error-when-trying-to-use-netmap/5986>\
**Category:** Zeek\
**Created:** [February 2, 2020, 8:22am UTC](https://community.zeek.org/t/error-when-trying-to-use-netmap/5986 "2020-02-02T08:22:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![clopmz](https://avatars.discourse-cdn.com/v4/letter/c/ebca7d/32.png) [@clopmz](https://community.zeek.org/u/clopmz)\
**Post date:** [February 2, 2020, 8:22am UTC](https://community.zeek.org/t/error-when-trying-to-use-netmap/5986/1 "2020-02-02T08:22:46Z")

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Hi all,

When I try to use netmap under a FreeBSD 12.1 host and Zeek 3.0.1 (installed from source), returns the following error:

root@fbsdzeek01:/nsm/zeek/spool/worker-1 # /opt/zeek/bin/zeek -i netmap::vtnet2

624.635003 nm\_open [920] NIOCREGIF failed: Invalid argument vtnet2

fatal error: problem with interface netmap::vtnet2 (Invalid argument)

bro-netmap plugin is installed. Any idea?

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**Author:** ![clopmz](https://avatars.discourse-cdn.com/v4/letter/c/ebca7d/32.png) [@clopmz](https://community.zeek.org/u/clopmz)\
**Post date:** [February 2, 2020, 8:45am UTC](https://community.zeek.org/t/error-when-trying-to-use-netmap/5986/2 "2020-02-02T08:45:29Z")

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Another test. I have tried to change network interface model to e1000, and error is the same.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/zeek/original/1X/f09d732bc2cc7c7cc7e35db67cf4e1d5233ce7a7.png) [@system](https://community.zeek.org/u/system)\
**Post date:** [May 6, 2022, 3:47pm UTC](https://community.zeek.org/t/error-when-trying-to-use-netmap/5986/3 "2022-05-06T15:47:02Z")

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