Great Circle Associates Firewalls
(February 1995)
 

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Subject: Prevention of LOCAL spoofing/duplicate I
From: "Robertson, Paul" <proberts @ moc1 . gannett . com>
Date: Thu, 02 Feb 95 10:26:00 PST
To: firewalls @ greatcircle . com, firewalls-owner @ GreatCircle . COM, "Wright, Robert" <rwright @ moc1 . gannett . com>
Encoding: 22 TEXT

[snip]
>We had an incident recently where someone used the same IP address on a
>machine
>(a PC running winsock) as one of our fileservers... nevertheless, the
>fileserver spazzed out, NFS went completey awry, and we were forced to
>start rebooting clients and the server to get things back to normal. 
>
>Besides going to 10BaseT (star configuration, intelligent hubs that only
>pass the proper IP address to the client connected to that leg of the hub) 
>Is there any way to prevent this? ANYONE can edit their Winsock configuration
>and make the IP address the same, and really hose your network... And this
>is internally... How do you prevent this, short of spending TONS of money
>on new hubs?
>
>                -jna

1. Put your production boxes on their own subnet.
2. Bootp your users

Before anyone says anything, bootp doesn't STOP them from using a valid
address, but it will stop them from doing so "accidently".


Indexed By Date Previous: Re: Supply-side spoofing prevention
From: btk @ matrix . cray . com (Bryan Koch)
Next: Intro to Firewalls pub available
From: John Wack <jwack @ nist . gov>
Indexed By Thread Previous: Re: Re[2]: tweaking PC setups for TCP/IP
From: CUETARA @ zorzal . metro . inter . edu
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From: John Wack <jwack @ nist . gov>

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