AW: Using TTL to Locate Hosts

["Meidinger Chris" <chris.meidinger () badenIT de>]

Hi Chris,

Look into a technique called firewalking. There you use ttl to find out how far behind a firewall or other packet 
filter a host has been placed.

There is a nice tutorial about writing a firewalk script in just a few lines with scapy - google firewalk + scapy to 
find it. That should get you started well enough that you can modify the tool for your own purposes.

Cheers,

Chris

----- Ursprüngliche Nachricht -----
Von: "Chris Hammer" <CHammer () fcbnm com>
An: "pen-test () securityfocus com" <pen-test () securityfocus com>
Gesendet: 30.03.06 06:40
Betreff: Using TTL to Locate Hosts


Hello everyone, I had an interesting question posed to me earlier. The
question was "Could you use only the TTL of a packet to locate hosts and
verify they are up?" I know playing around with Tracert this could be
possible, or a crafted packet using HPING. Any other ideas or thoughts?
 
Thanks!
Chris


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This List Sponsored by: Cenzic

Concerned about Web Application Security?
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