RE: Rogue DHCP servers

["Martin Jr., D. Michael" <martinm () montevallo edu>]

ACLs are your friends.  BUT, when you have legacy wiring and hubs and
all of the users on one VLAN (and that is your only choice because of
the wiring and existing infrastructure), ACLs aren't that viable.

In our setting, each person in our residence halls is connected to a
10Mb Baystack Hub.  In turn, each building (with multiple hubs in the
building) is then connected to a central campus Cisco switch.  We could
implement ACLs at that switch level but that does not keep students from
putting DHCP servers (and routers...and they buy those for their rooms
all the time) within the building.

I need to use Snort to detect those routers in those building
proactively so we can go and find them and disconnect them from the
network so that services can be restored to the rest of the student
population.

Thanks,

Michael

-----Original Message-----
From: Jason Haar [mailto:Jason.Haar () trimble co nz] 
Sent: Thursday, October 30, 2003 6:28 PM
To: snort-users () lists sourceforge net
Subject: Re: [Snort-users] Rogue DHCP servers

On Thu, Oct 30, 2003 at 04:58:27PM -0600, Martin Jr., D. Michael wrote:
> No.  It is a residence hall network.  Therefore, we have anything and
> everything imaginable (FreeBSD, Linux, Windows, MacOS, etc...).

ACLs on switches are your friends...

-- 
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1


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