From: barmar@alum.mit.edu   
      
   In article ,   
    Josef Moellers  wrote:   
      
   > On 03/13/2013 01:46 PM, Jorgen Grahn wrote:   
   > > On Tue, 2013-03-12, Josef Moellers wrote:   
   > > ...   
   > >> I've found it myself: The TCP header checksum must include parts of the   
   > >> IP Header! Thus, my checksum was bad and the TCP layer discarded the RST   
   > >> packet.   
   > >   
   > > 'tcpdump -v' would have told you this, at least on the side receiving   
   > > the RST.  That side would also have recorded a bad checksum discard in   
   > > 'netstat -s'.   
   >   
   > I used wireshark, but it only said:   
   >   
   >     Checksum: 0xf89a [validation disabled]   
   >         [Good Checksum: False]   
   >         [Bad Checksum: False]   
      
   Wireshark is just a graphical version of tcpdump. I think they both   
   disable validating checksums if your system offloads it to the NIC.   
      
   --   
   Barry Margolin   
   Arlington, MA   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)