# unknown data link type 0xc **URL:** \ **Category:** Zeek\ **Created:** [July 11, 2005, 4:25pm UTC](https://community.zeek.org/t/unknown-data-link-type-0xc/807 "2005-07-11T16:25:54Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Martin\_Petraschek](https://avatars.discourse-cdn.com/v4/letter/m/e9a140/32.png) [@Martin\_Petraschek](https://community.zeek.org/u/Martin_Petraschek)\ **Post date:** [July 11, 2005, 4:25pm UTC](https://community.zeek.org/t/unknown-data-link-type-0xc/807/1 "2005-07-11T16:25:54Z")
Hi! When I execute bro on a sample pcap file, I get the following error: bro: problem with trace file /data/syndata/trace.cap - unknown data link type 0xc What does that mean? The pcap file is OK and can be read with tcpdump -r Thank you very much, Martin ---
**Author:** ![Christian\_Kreibich3](https://avatars.discourse-cdn.com/v4/letter/c/4af34b/32.png) [@Christian\_Kreibich3](https://community.zeek.org/u/Christian_Kreibich3)\ **Post date:** [July 12, 2005, 12:11am UTC](https://community.zeek.org/t/unknown-data-link-type-0xc/807/2 "2005-07-12T00:11:52Z")
Hi Martin, ---
**Author:** ![Martin\_Petraschek](https://avatars.discourse-cdn.com/v4/letter/m/e9a140/32.png) [@Martin\_Petraschek](https://community.zeek.org/u/Martin_Petraschek)\ **Post date:** [July 12, 2005, 7:33am UTC](https://community.zeek.org/t/unknown-data-link-type-0xc/807/3 "2005-07-12T07:33:40Z")
I upgraded from the latest stable release (0.8a88) to the latest developer release (0.9a9), and now it works! Thanks for the hint! Martin ---
**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, 3:37pm UTC](https://community.zeek.org/t/unknown-data-link-type-0xc/807/4 "2022-05-06T15:37:34Z")