Wireshark · Ethereal-users: Re: [Ethereal-users] finding crc errors

[Michael Tuexen <Michael.Tuexen@xxxxxxxxxxxxxxxxx>]

Just to be clear:

Ethernet uses a CRC,
TCP uses a checksum.

Best regards
Michael

On Sep 7, 2004, at 5:53 Uhr, Hansang Bae wrote:

> On 03:55 PM 8/31/2004, Neil wrote:
> > Hey guys,
> > I'm looking for a way for finding crc errors in TCP header just like 
> > how it was mentioned here, 
> > http://www.networkuptime.com/tips/crc_in_tcp/index.html
> > Unfortunately, it is not for Ethereal. So how do we search CRC 
> > problems in Ethereal? Can someone walk me through please?
>
> Are you looking for Ethernet checksum information or TCP crc info?  
> Unless you have a) a hub based network or b) Cabletron switches, you 
> will not be able to capture Ethernet checksum issues.  All the 
> switches that I worked with will not pass along damaged Ethernet 
> frames.  Cabletron was the exception.
>
> hsb
>
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