Wireshark · Wireshark-dev: Re: [Wireshark-dev] Sometimes SLL/Linux cooked-mode capture is decoded and sometimes its not (differ

[Pascal Quantin <pascal.quantin@xxxxxxxxx>]

Hi Michael,

Le jeu. 7 juin 2018 à 23:32, Michael Lum <michael.lum@xxxxxxxxxxxxxxxxx> a écrit :

Hi,

 

I've attached two captures with a single packet in each.

 

They are both supposed to be syslog events injected into the capture with SLL (Linux cooked capture).

 

On one everthing is decoded as expected in the other with the same first 16 octets it is detected as

Ethernet II only.

 

I cannot figure out why they are not both decoded as SLL/Linux cooked-mode captures.

 

Any thoughts would be greatly appreciated.

 

I'm running on Windows 7 using Wireshark 2.6.1.

The capture was taken on a CentOs 7 box by a tool injecting the "fake" syslog message.

This comes from the encapsulation type stored in the pcap file: one is using 25 (Linux coooked capture) while the other one is using 1 (ethernet). So something is wrong with the tool used to capture the second pcap.

You can fix the file with the following command: editcap -T linux-sll sll-not_detected.pcap sll-not_detected_fixed.pcap

Best regards,

Pascal.