Is there LAN topology mapping software available in Ubuntu?

view full story

http://askubuntu.com – I need to do a graphical map of all the layer-2 and layer-3 machines running in my LAN. I don't want a graphical tool like Dia or similar, but a kind of "graphical Nmap" which shows the real cabling of the LAN (including switches, too!). In fact, something like this: http://www.solarwinds.com/network-topology-mapper.aspx (HowTos)