# Specification of log fields **URL:** \ **Category:** Zeek\ **Created:** [September 4, 2013, 5:14pm UTC](https://community.zeek.org/t/specification-of-log-fields/2804 "2013-09-04T17:14:07Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Nuno\_Rodrigues](https://avatars.discourse-cdn.com/v4/letter/n/f1d935/32.png) [@Nuno\_Rodrigues](https://community.zeek.org/u/Nuno_Rodrigues)\ **Post date:** [September 4, 2013, 5:14pm UTC](https://community.zeek.org/t/specification-of-log-fields/2804/1 "2013-09-04T17:14:07Z")
Dears Sirs, I'm a recent user of Bro, so excuse me if this is a basic question... I need to find the exact meaning of each field of log files. For example, "duration is in seconds, miliseconds...?", "difference between orig\_bytes and orig\_ip\_bytes" and so on. Still exist this information published in any place? Thanks in advance! Best regards, Nuno. ---
**Author:** ![Siwek\_Jon](https://avatars.discourse-cdn.com/v4/letter/s/90db22/32.png) [@Siwek\_Jon](https://community.zeek.org/u/Siwek_Jon)\ **Post date:** [September 4, 2013, 6:00pm UTC](https://community.zeek.org/t/specification-of-log-fields/2804/2 "2013-09-04T18:00:35Z")
> I need to find the exact meaning of each field of log files. For example, "duration is in seconds, miliseconds...?", "difference between orig\_bytes and orig\_ip\_bytes" and so on. You can usually find descriptions if you browse the script reference documentation like at [1]. Generally, for fields of type "interval" (like "duration"), the unit is seconds. - Jon [1] [http://bro.org/sphinx/scripts/base/protocols/conn/main.html#type-Conn::Info](http://bro.org/sphinx/scripts/base/protocols/conn/main.html#type-Conn::Info) ---
**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, 3:41pm UTC](https://community.zeek.org/t/specification-of-log-fields/2804/3 "2022-05-06T15:41:12Z")