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Network Security Focus-IDS
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Re: Scan for "outsider" Pcs on network

Subject: Re: Scan for "outsider" Pcs on network
Date: Fri, 17 Mar 2006 15:51:07 +0000
   Yes, but the hub must be deployded by someone who has a usernameand password 
to connect to your network. It is like you wonÂt usekeylocks in the door just 
because someone can lend the key to some onenot authorized. So for me, wireless 
and wired is the same.
-tlecu


On 15/03/06, auto62996@hushmail.com <auto62996@hushmail.com> wrote:> 802.1X 
works quite well in a wireless environment where there is> continual 
authentication of the client but it can be subverted on a> wired LAN simply by 
using a $10 hub. Attaching a legitimate device> to the hub will keep the switch 
port open and allow anything else> you connect to the hub to access the LAN.>> 
-----Original Message-----> From: Eagle Fire 
[mailto:tlecuauhtli@googlemail.com]> Sent: 13 March 2006 10:06> To: 
focus-ids@securityfocus.com> Subject: Re: Scan for "outsider" Pcs on network>>> 
 Could be 802.1X an alternative? Probably hard to deploy, switches> and 
wireless AP with the feature and some OS challenges but it may> be a 
solution.>>  -tlecu>> On 09/03/06, Ron Gula <rgula@tenablesecurity.com> wrote:> 
At 05:15 AM 3/6/2006, Mircea MITU wrote:> > >On Thu, 2006-03-02 at 23:47 
+0000, dhamm@jackofallgames.com> wrote:> > > > Is there a way to setup a scan 
and be notified of an> intruding pc> > > > that is physically plugged into the 
network?> > >> > >Sure, use arpwatch.> >> > Actually, this will find "new" 
hosts all the time with little> > discrimination between a new valid laptop on 
the LAN and a> visiting> > consultant in the conference room.> >> > A lot of 
SIMs have the ability to process log files (such as> those of> > arpwatch or 
the dhcp logs of a Windows server) and identity the> MAC> > address. If you can 
recognize a "new" MAC address and also> associate> > it with something 
interesting like "the conference room" or "the> > server farm" you can specify 
different levels of alerting or> logging.> > An example of this is here in one 
of Tenable's TASL event> correlation> > rules:> >> > 
http://cgi.tenablesecurity.com/tasl/new_mac.tasl> >> > The particular script is 
simple in that it just alerts on> > a new MAC addr. Different scripts could 
consume output of this> script> > and have 2nd order alerts depending on the 
location of the IP> address> > issued, the type of MAC, .etc.> >> > Ron Gula, 
CTO> > Tenable Network Security> >> >>>>>> Concerned about your privacy? 
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