Wireshark · Ethereal-users: Re: [Ethereal-users] TCP Checksum Incorrect.

[Jeff Morriss <jeff.morriss@xxxxxxxxxxx>]

Salvador Ruiz García wrote:
> Hi,
>  
> I have problems with Ethereal and the TCP Checksum. In TCP packets from 
> my PC (128.127.50.15 in the capture file) indicates "TCP CHECKSUM 
> INCORRECT". I think there is a problem with Ethereal because both 
> computers are comunicating well. Packets arriving my PC are correct.
>  
> In "Preferences -> Protocols -> TCP"  the option "Check the Validity of 
> the TCP checksum when posible" is checked. My computers run Windows XP. 
> I use Ethereal 0.10.12 but I had the same problems with older versions 
> (Not in Ethereal 0.10.5) Running with WinPcap version 3.1 beta4 
> (packet.dll version 3, 1, 0, 24), based on libpcap version 0.8.3 on 
> Windows XP Service Pack 2, build 2600.

See:

http://www.ethereal.com/faq.html#q5.14