Ethereal-users: Re: [Ethereal-users] Using ethereal on windows to monitor network traffic

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From: Hansang Bae <hbae@xxxxxxxxxx>
Date: Tue, 22 Nov 2005 23:50:42 -0500
At 01:11 PM 11/18/2005, Lamont McGee wrote:
>I would like to use ethereal to solve a bandwidth problem, we have several servers on a switched network that is running very slow.  Can I use ethereal to find out which servers are using the most bandwidth?  And if the answer is yes.  How?



First thing is first.  Quantify slow.  If you ftp a 10MByte file *TO AND FROM* two servers, what transfer rates do you get?  

Do you show any errors on the ports?  My gut tells me you have (in order of likelihood) 
a) duplex mismatch or 
b) bad cabling or 
c) NIC driver issues


Remember that duplex settings *HAVE* to match.  Either put it auto/auto on both sides or hard code it on both sites.  Also keep in mind that 1000Base-T (copper GigE) *REQUIRES* auto negotiation so don't hard code it.

hsb