From: usenet+6@ladybug.xs4all.nl   
      
   On Sat, 28 Nov 2009 13:45:27 +0100, Steinar Haug wrote:   
      
   >> >>> Data payloads with length greater than the MSS negotiated are being   
   >> >>> exchanged. I would like to know under which conditions are payloads   
   >> >>> greater than the MSS exchanged? Further, is there a way to limit the   
   >> >>> payloads to the specified MSS value?   
   >> >>   
   >> >> I've seen this happening with NICs that do tcp offloading. In that case,   
   >> >> the frame you see in tcpdump is NOT what goes over the wire, but what the   
   >> >> OS send to the card. FWIW, this was on AIX.   
   >> >   
   >> > The original post states that this occurred on the loopback device   
   >>   
   >> Linux has TSO enabled on the loopback device since version 2.6.27.   
   >>   
   >> # ethtool -k lo   
   >> [...]   
   >> tcp segmentation offload: on   
   >   
   > Um, what exactly do you offload this processing to? Since the loopback   
   > interface is internal on the machine (internal to the operating system   
   > if you wish), I don't really see the point of TSO ...   
      
   It would prevent TCP segmentation by just copying the application data   
   from sender to receiver.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)