# Surritca error on a wireguard wg1 interface

**URL:** <https://forum.suricata.io/t/surritca-error-on-a-wireguard-wg1-interface/3912>\
**Category:** Help\
**Tags:** opnsense\
**Created:** [September 10, 2023, 9:47pm UTC](https://forum.suricata.io/t/surritca-error-on-a-wireguard-wg1-interface/3912 "2023-09-10T21:47:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Monju0525](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.suricata.io/monju0525/32/2352_2.png) [@Monju0525](https://forum.suricata.io/u/Monju0525)\
**Post date:** [September 10, 2023, 9:47pm UTC](https://forum.suricata.io/t/surritca-error-on-a-wireguard-wg1-interface/3912/1 "2023-09-10T21:47:30Z")

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I am using a opnsense router 's Intrusion Detection and put Suricata on a wireguard interface  
The MTU and MSS are at default values. Suricata does not block www.eicar.eu eicar.com.txt file  
I think it is because of the warning below:

023-09-10T17:28:55-04:00 Warning suricata [100202] – [ERRCODE: SC\_ERR\_SYSCALL(50)] - Failure when trying to get MTU via ioctl for ‘wg1’: Device not configured (6)

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**Author:** ![sbhardwaj](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.suricata.io/sbhardwaj/32/10_2.png) [@sbhardwaj](https://forum.suricata.io/u/sbhardwaj)\
**Post date:** [September 11, 2023, 12:06pm UTC](https://forum.suricata.io/t/surritca-error-on-a-wireguard-wg1-interface/3912/2 "2023-09-11T12:06:30Z")

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Hi @Monju0525 ! Welcome to our forum! 🙂  
Could you please tell:

- what version of Suricata are you running
- how did you start it
- what is the status of the device `wg1`? It should be UP