topic Re: ASA capture files not being read by Wireshark in Network Security

ASA capture files not being read by Wireshark

Kevin Melton — Mon, 11 Mar 2019 16:08:06 GMT

I took some capture files this morning on our ASA appliance. I actually view the packets being captured with the real time command. Once I had what I needed, I ended the capture. I then FTP the trace files to my workstation, opened Wireshark to then point to the files. I keep getting this message when I try to open the files::The file "C:\FTProot\lori_ip" isn't a capture file in a format Wireshark understands. I have tried using both a .pcap and a .cap extension. I am still getting the same error message.

Wireshark is opening other files just fine.

Re: ASA capture files not being read by Wireshark

Kevin Redmon — Thu, 20 Aug 2009 20:39:02 GMT

When transferring the capture files, you must be sure to leverage the '/pcap' parameter to copy the file as a valid *.pcap file. You probably downloaded the file as the textual version. You may still be able to glean some information from the file if you open it within a text viewer.

You can also download the files leveraging the following URL:

https:///capture//pcap

Here's a helpful link for the packet capture feature:

http://www.nortfm.com/?View=entry&EntryID=1

Re: ASA capture files not being read by Wireshark

Kevin Melton — Thu, 20 Aug 2009 20:53:30 GMT

I am still having difficulty "leveraging" with the "/pcap" parameter. Where exactly in the copy command does it belong. I have tried it everywher and the ASA is just not liking it...

Re: ASA capture files not being read by Wireshark

robertson.michael — Fri, 21 Aug 2009 17:00:31 GMT

Hi Kevin,

Using the capture command, the syntax would look like this:

copy /pcap capture:[context/]

Here is a link to the command reference also:

http://www.cisco.com/en/US/docs/security/asa/asa80/command/reference/c4.html#wp2123161

Hope that helps.

-Mike