I have a bunch of 3500XL switches thruout my customer's lan.
They are having a problem with unknown mac keep appearing and disappearing
from the network.
I can trace the mac-address of the unknown station by "show mac" from the
swtich CLI.
What's strange is that it appears at one switch, but a min
)
Martijn
-Oorspronkelijk bericht-
Van: Firesox [mailto:[EMAIL PROTECTED]
Verzonden: maandag 11 augustus 2003 14:19
Aan: [EMAIL PROTECTED]
Onderwerp: 3500XL - duplicate IP and Windows NT/2000 server [7:73868]
I have a bunch of 3500XL switches thruout my customer's lan.
They are having a pr
T&T Business Service Delivery NSPM
> -Original Message-
> From: Reimer, Fred [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, August 12, 2003 11:08 AM
> To: [EMAIL PROTECTED]
> Subject: RE: 3500XL - duplicate IP and Windows NT/2000 server
> [7:73868]
>
>
> Huh? You&#x
EMAIL PROTECTED]
Onderwerp: 3500XL - duplicate IP and Windows NT/2000 server [7:73868]
I have a bunch of 3500XL switches thruout my customer's lan.
They are having a problem with unknown mac keep appearing and disappearing
from the network.
I can trace the mac-address of the unknown station by
Firesox [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 12, 2003 8:50 AM
To: [EMAIL PROTECTED]
Subject: Re: 3500XL - duplicate IP and Windows NT/2000 server [7:73868]
The log on NT says
Duplicate IP found with the mac address xx.xx.xx.xx.xx.xx
All NT servers say the same thing with same exa
newer IOS? (long shot)
>
> Martijn
>
> -Oorspronkelijk bericht-
> Van: Firesox [mailto:[EMAIL PROTECTED]
> Verzonden: maandag 11 augustus 2003 14:19
> Aan: [EMAIL PROTECTED]
> Onderwerp: 3500XL - duplicate IP and Windows NT/2000 server [7:73868]
>
>
> I have a bunch of
TED]
> Sent: Tuesday, August 12, 2003 7:50 AM
> To: [EMAIL PROTECTED]
> Subject: Re: 3500XL - duplicate IP and Windows NT/2000 server
> [7:73868]
>
>
> The log on NT says
>
> Duplicate IP found with the mac address xx.xx.xx.xx.xx.xx
>
> All NT servers say the sam
TED]
> Sent: Tuesday, August 12, 2003 7:50 AM
> To: [EMAIL PROTECTED]
> Subject: Re: 3500XL - duplicate IP and Windows NT/2000 server
> [7:73868]
>
>
> The log on NT says
>
> Duplicate IP found with the mac address xx.xx.xx.xx.xx.xx
>
> All NT servers say the sam
Well, the thing is the MAC addrss appears to be moving around thruout the
network.
One time I see the mac stored in one switch, then onto another switch the
next.
Another time, the MAC address disappears from the network all together.
Whatever this mac is, it's causing the duplicate IP on the netwo
Fred Reimer - CCNA
Eclipsys Corporation, 200 Ashford Center North, Atlanta, GA 30338
Phone: 404-847-5177 Cell: 770-490-3071 Pager: 888-260-2050
NOTICE; This email contains confidential or proprietary information which
may be legally privileged. It is intended only for the named recipient(s).
As far as the duplicate MACs go, it sounds like you have a layer-2 loop.
Especially considering that all of your servers are experiencing the
problem. When they ARP to verify that no other station has their IP,
they see their own ARP and assume that another station is doing the same
thing.
Lay
Message-
From: Firesox [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 12, 2003 7:50 AM
To: [EMAIL PROTECTED]
Subject: Re: 3500XL - duplicate IP and Windows NT/2000 server [7:73868]
The log on NT says
Duplicate IP found with the mac address xx.xx.xx.xx.xx.xx
All NT servers say the same thing with
Firesox wrote:
> I have a bunch of 3500XL switches thruout my customer's lan.
> They are having a problem with unknown mac keep appearing and disappearing
> from the network.
>
> I can trace the mac-address of the unknown station by "show mac" from the
> swtich CLI.
> What's strange is that it app
: 3500XL - duplicate IP and Windows NT/2000 server
[7:73868]
I smell scriptkiddie... I'm not sure how a mac could travel from one
neighbor table to another though, sounds very strange... when you sho mac
addr XXX is the counterfeit MAC always coming in on the same port(s)???
-
14 matches
Mail list logo
