Re: Network Configuration Question?

["netsec novice" <netsec9 () hotmail com>]

I recently saw similar behaviour running tcpdump on my workstation that is 
attached to a Cisco catalyst switch.  I would be interested to find any 
answers myself.






> From: "Ian Lyte" <ilyte () alias666 freeserve co uk>
> To: <security-basics () securityfocus com>
> Subject: Network Configuration Question?
> Date: Mon, 4 Nov 2002 16:58:37 -0000
>
> Hi All,
>
>     On a corporate machine, I was having trouble removing the TinyBar
> scrote-ware that had installed itself surreptitiously onto my machine. As
> part of the process of tracking down how it was running, I downloaded a
> small packet sniffer and ran it so I could attempt to trace the outgoing
> target address of the pop-up window.
>
>     We are on a 100mbs switched network (I believe switched but ..).
>
>     Now imagine my surprise when I could pick up traffic from around 6 
> other
> machines, including HTTP, POP, SMTP and all the associated passwords.
>
>     Some of the machines were geographically close to me in the office but
> not all. How could this happen on a switched network - has one of the
> switches fallen over into broadcast mode or something? If so how do I go
> about determining (remotely) why/how it has fallen over, who else is on the
> segment, and what other avenues do I have to explore?
>
>     Thanks in advance
>
> Ian


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