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'td' is a topology discovery program with a client/server
architecture. The design is platform independent, but this
instance of the implementation is not. In order to be detected, each machine in a network must
be running the td server in order to be detected. Closure is provided
using a hint: the user-estimated network diameter provided as a
command-line argument.

td is written such that topology is discovered in a recursive manner. 
When a server receives an 'inquiry' packet   

A single client broadcasts an 'inquiry' packet to its local server.

across all interfaces
that are     

Limitations:
- This implementation is restricted to FreeBSD