# Method to detect tcp urgent flag

**URL:** <https://community.zeek.org/t/method-to-detect-tcp-urgent-flag/6068>\
**Category:** Zeek\
**Created:** [April 1, 2020, 4:39pm UTC](https://community.zeek.org/t/method-to-detect-tcp-urgent-flag/6068 "2020-04-01T16:39:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tyrone\_Smith](https://avatars.discourse-cdn.com/v4/letter/t/c68b51/32.png) [@Tyrone\_Smith](https://community.zeek.org/u/Tyrone_Smith)\
**Post date:** [April 1, 2020, 4:39pm UTC](https://community.zeek.org/t/method-to-detect-tcp-urgent-flag/6068/1 "2020-04-01T16:39:07Z")

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Hi,

First time posting. Links to documentation and RTM comments are welcome responses. Please be patient.

Is there an easy method to trigger an event based on the TCP urgent flag? I am looking at Zeek::TCP tcp\_packet but it is listed as a low level and noisy event. I’d like to setup something that leverages Zeek instead of a separate tcpdump. I’d like to use connection events but I do not see an easy way to detect if the urgent flag is set.

If anyone has ideas/solutions better than tcp\_packet or tcpdump, I’d love to get that feedback. Thanks.

Tyrone Smith  
University of Delaware  
Security Operations

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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/method-to-detect-tcp-urgent-flag/6068/2 "2022-05-06T15:47:10Z")

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