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List:       ntop
Subject:    RE: [Ntop] Q: Does ntop detect duplicate MAC addresses?
From:       "McNutt, Justin M." <McNuttJ () missouri ! edu>
Date:       2001-06-15 13:37:15
Message-ID: 44D2ED0AC0121146BF01366481060EBE6FFC22 () umc-mail02 ! missouri ! edu
[Download RAW message or body]

No one station can detect duplicate MAC addresses.  It takes a device like a
switch, a router, or a smart netadmin to detect that.

Even seeing multiple packets with different IPs but the same MAC isn't
conclusive.  You can put more than one IP address on a workstation.
(Although if none of *your* workstations are configured that way, you've got
it.)

--J

> -----Original Message-----
> From: Anthony Howe [mailto:achowe@snert.com]
> Sent: Friday, June 15, 2001 8:33 AM
> To: ntop maillist
> Subject: [Ntop] Q: Does ntop detect duplicate MAC addresses?
> 
> 
> Does ntop detect duplicate MAC addresses?
> 
> A computer store I deal with tells me it is possible from their 
> experience to end up with duplicate MAC addresses in a network, 
> particularly when a motherboard with intergrated ethernet is flashed
> with a BIOS upgrade. Some BIOS upgrades reset the MAC address to a 
> factory default. They painfully found this out once while updating a 
> school's network and endup with several duplicate MACs.
> 
> -- 
> Anthony C Howe                            +33 6 11 89 73 78        
> http://www.snert.com/                          ICQ# 7116561
> "Microsoft (cough, sputter, spit, !@#$%) ..."
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