Re: Layer 2 Trace

[Cedric Blancher <blancher () cartel-securite fr>]

Le vendredi 02 décembre 2005 à 17:38 +0000, riftman a écrit :
> The idea was trying to discover switches/bridges/translational bridges
> which would be transparent to your L3 traceroute.

Thing is L3 traceroute relies on IP implementing error signaling using
ICMP. L2 does not implement such a service, therefore generic L2
traceroute should be imho very difficult to achieve.

But, if you are facing specific hardware, you can try to discover L2
devices through specific tools and features (see Cisco tool mentionned
before), layer 2 discovery protocols such as CDP or analysing specific
layer 2 signaling protocols (STP, VTP, etc.) if you can access them.


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