Arp spoofing & dsniff

[Vs Metal <vserpoul () isep fr>]

  I'm actually doing some researches about switched 
networks security, on cisco switches ( 2900, 2950XL... ). I 
used some prgs of the dsniff suite like dsniff itself, 
macof and arpspoof. My problem is that my attacks on these 
switches have not succeeded using :
- macof : it didn't lead to anything. Dsniff didn't sniff 
anything as i launched it during a telnet session on my 
small local network between to  win2000 pcs.
- arpspoof : as soon as i lauch arpspoof, the network is 
almost out of service. I mean i can still ping pcs between 
eachother, but the telnet sessions won't open. ( I ENABLED 
THE IPFORWARDING OPTION ON MY LINUX COMPUTER, and it works 
as the pings go through it ).

  Any ideas of the way of making it work ? I'm really 
stucked and a presentation is scheduled for 
tuesday !!! :o), so any ideas will be gratefully 
appreciated :D.

              thx in advance....

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