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OSTU - Sake Blok on Unattended Packet Capturing with Dumpcap
 

OSTU - Sake Blok on Unattended Packet Capturing with Dumpcap

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Sake Blok, a Wireshark/Ethereal devotee since 1999, works as a Research & Development Engineer for ion-ip in the Netherlands (http://www.ionip.com) . His company provides solutions to customers who ...

Sake Blok, a Wireshark/Ethereal devotee since 1999, works as a Research & Development Engineer for ion-ip in the Netherlands (http://www.ionip.com) . His company provides solutions to customers who want to deliver their applications to users in a fast, secure, efficient and scalable manner. Sake\\\'s main focus is to take new products for a spin in their test environment, design custom solutions for customers and troubleshoot the problems customers might encounter while using ion-ip solutions. Two years ago (2006), Sake started to add the functionality he was missing to Wireshark. He also started to fix Wireshark-bugs that were reported on Bugzilla. This work on Wireshark resulted in an invitation from Gerald Combs to join the Wireshark Core Development Team in 2007.

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    OSTU - Sake Blok on Unattended Packet Capturing with Dumpcap OSTU - Sake Blok on Unattended Packet Capturing with Dumpcap Presentation Transcript

    • Unattended Packet Capturing with Dumpcap July 2008
    • Welcome Back!
      • Second episode of monthly series about using the wireshark CLI tools
      • The other episodes can be found at: http://www.lovemytool.com/blog/2008/06/ostu_tshark.html
      Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008
    • This months topic
      • In this second episode, I will show you how to use dumpcap to capture packets for an extended period
      • You will learn:
        • why wireshark and tshark use dumpcap
        • why you want to use dumpcap
        • how to use dumpcap
        • how to use a ringbuffer of files (for unattended capturing)
      Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008
    • why wireshark and tshark use dumpcap
      • 1.6 million lines of code
      • most code is for dissecting, only small part for capturing
      • often need to run as root ==> Security Risk!
      • privilege separation between capturing and dissecting
      Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008
    • why you want to use dumpcap
      • Just network to disk
      • low level of packet drops
      • no state information kept
      • Perfect for long term capturing
      • lean mean capture machine :-)
      Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008
    • capturing with dumpcap Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008 $ dumpcap -i 3 -w all.cap File: all.cap Packets: 66512 Packets dropped: 0 $ $ dumpcap -i 3 -w arp.cap -f arp File: arp.cap Packets: 4 Packets dropped: 0 $
    • automatically stopping a capture Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008 $ dumpcap -i3 -w one_megabyte.cap -a filesize:1024 File: one_megabyte.cap Packets: 1350 Packets dropped: 0 $ $ dumpcap -i3 -w one_minute.cap -a duration:60 File: one_minute.cap Packets: 155588 Packets dropped: 0 $ $ dumpcap -i 3 -w 10000.cap -c 10000 File: 10000.cap Packets: 10000 Packets dropped: 0 $
    • capturing to multiple files Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008 $ dumpcap -i3 -w per_10sec.cap -a files:4 -a filesize:8192 File: per_10sec_00001_20080712181944.cap Packets: 10253 File: per_10sec_00002_20080712181948.cap Packets: 20603 File: per_10sec_00003_20080712181951.cap Packets: 30814 File: per_10sec_00004_20080712181955.cap Packets: 40928 Packets dropped: 0 $ $ dumpcap -i3 -w per_10sec.cap -a files:4 -b duration:10 File: per_10sec_00001_20080712182604.cap Packets: 29009 File: per_10sec_00002_20080712182615.cap Packets: 51308 File: per_10sec_00003_20080712182626.cap Packets: 80406 File: per_10sec_00004_20080712182637.cap Packets: 110665 Packets dropped: 0 $
    • capturing to a ringbuffer of files Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008 $ dumpcap -i3 -w keep_last_4.cap -b files:4 -b filesize:8192 File: keep_last_4_00001_20080712183216.cap Packets: 10239 File: keep_last_4_00002_20080712183220.cap Packets: 20524 File: keep_last_4_00003_20080712183223.cap Packets: 30655 File: keep_last_4_00004_20080712183227.cap Packets: 40895 File: keep_last_4_00005_20080712183230.cap Packets: 51216 File: keep_last_4_00006_20080712183233.cap Packets: 61475 File: keep_last_4_00007_20080712183238.cap Packets: 71630 File: keep_last_4_00008_20080712183241.cap Packets: 81852 File: keep_last_4_00009_20080712183245.cap Packets: 83282 Packets dropped: 0 $ $ $ ls -1 keep_last_4_0000* keep_last_4_00006_20080712183233.cap keep_last_4_00007_20080712183238.cap keep_last_4_00008_20080712183241.cap keep_last_4_00009_20080712183245.cap $
    • That's all folks!
      • More info:
        • dumpcap manpage ( http://www.wireshark.org/docs/man-pages/dumpcap.html )
      • Next months episode: "capture file manipulation with tshark, editcap and mergecap (part I: selecting packets)"
      • e-mail: [email_address]
      Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008
      • LoveMyTool.com Community for Network Monitoring & Management Tools
      • For additional educational videos on Open Source Network Tools, please visit: http://www.lovemytool.com/blog/ostu.html
      Sake Blok on… Unattended Packet Capturing with Dumpcap Network Analysis Community Center (http://www.netcc.nl) July 2008