IDS mailing list archives
Sniffer v.4.0 to tcpdump capture file conversion headache
From: "Carles Fragoso i Mariscal" <cfragoso () cesca es>
Date: Wed, 6 Aug 2003 04:10:30 +0200
Maybe someone has dealt with this matter before and could prevent me from getting a big headache. :) I have been given some capture files which are not libpcap formatted: [root@honey tmp]# file capture.dump capture.dump: Sniffer capture file - version 4.0 (Ethernet) I want to process those files with some libpcap enabled tools such as tcpdump and snort so I applied file-conversion using the 'editcap' command from ethereal package: [root@honey tmp]# /usr/sbin/editcap -F libpcap capture.dump capture.new [root@honey tmp]# file capture.new capture.new: tcpdump capture file (little-endian) - version 2.4 (Ethernet) The problem is that after the conversion it seems to be a libpcap file and I can see the whole content properly but BPF filters DO NOT work!!!: [root@honey tmp]# tcpdump -nr capture.new ... HH:MM:SS.ssssss 802.1Q vlan#NNN P0 x.y.w.z.srcport > a.b.c.d.dstport: (..etc..) ... [root@honey tmp]# tcpdump -nr capture.new 'host x.y.w.z' [root@honey tmp]# In case it could help, I should say that the content is ethernet encapsulation with vlan tagging. Thanks in advance folks, -- Carlos --------------------------------------------------------------------------- Captus Networks - Integrated Intrusion Prevention and Traffic Shaping - Instantly Stop DoS/DDoS Attacks, Worms & Port Scans - Automatically Control P2P, IM and Spam Traffic - Ensure Reliable Performance of Mission Critical Applications Precisely Define and Implement Network Security and Performance Policies **FREE Vulnerability Assessment Toolkit - WhitePapers - Live Demo Visit us at: http://www.captusnetworks.com/ads/31.htm ---------------------------------------------------------------------------
Current thread:
- Sniffer v.4.0 to tcpdump capture file conversion headache Carles Fragoso i Mariscal (Aug 06)
- RE: Sniffer v.4.0 to tcpdump capture file conversion headache Carles Fragoso i Mariscal (Aug 07)