Penetration Testing mailing list archives
RE: discovering network layout at layer2
From: Brian_Peterson () Dell com
Date: Wed, 11 Feb 2004 16:45:14 -0600
Cisco's layer 2 discovery protocol is CDP, which is enabled by default. You can either find a tool to enumerate devices using CDP or you can write a script to ssh, rsh, or telnet in and issue the 'sh cdp neighbor detail' command to learn about all directly connected layer 2 devices, then issue the same command on those devices, etc., until you have it all mapped out. -----Original Message----- From: Dev [mailto:u02113 () cs unipune ernet in] Sent: Friday, February 06, 2004 10:27 AM To: pen-test () securityfocus com Subject: discovering network layout at layer2 Hello ppl, I am new to this list. Plz redirect me to another list if this is not the appropriate list to post to this query. Having read the phrack article "Fun with the spanning tree protocol", I was wondering as to how i could use some layer2 protocols to my advantage to discover the network layout of my campus network (at layer 2). Additionally, all equipment is CISCO. Identification of my nearest switch is easily done by sniffing for STP BPDU packets & i did receive the STP hello BPDU packets on the user port that our gateway was connected to. This kind of packet gives me the following information: 1) How many more STP -capable devices are there up to the root bridge (root path cost) 2) The bridge & port ID & the root bridge & port ID. Can somebody suggest how can i find out my network topology using this STP protocol or some other layer2 protocol (CDP?? etc). regards, Devrat Mittal u02113 () cs unipune ernet in Department of computer Science University of Pune Pune. --------------------------------------------------------------------------- ---------------------------------------------------------------------------- --------------------------------------------------------------------------- Free trial: Astaro Security Linux -- firewall with Spam/Virus Protection Protect your network with the comprehensive security solution that integrates six applications for ease of use and lower TCO. Firewall - Virus protection - Spam protection - URL blocking - VPN - Wireless security. Download 30-day evaluation at: http://www.astaro.com/php/contact/securityfocus.php ----------------------------------------------------------------------------
Current thread:
- discovering network layout at layer2 Dev (Feb 06)
- <Possible follow-ups>
- RE: discovering network layout at layer2 Aditya [ Aditya Lalit Deshmukh ] (Feb 11)
- Re: discovering network layout at layer2 Harry de Grote (Feb 12)
- RE: discovering network layout at layer2 Rob Shein (Feb 12)
- RE: discovering network layout at layer2 Brian_Peterson (Feb 12)
- RE: discovering network layout at layer2 Dave Killion (Feb 13)