Re: [44net] strange traffic

On Wed, 2012-02-22 at 18:10 +0100, Rob Janssen wrote:

 Header checksum: 0x3b1e [incorrect, should be 0x2746]
     [Good: False]
     [Bad: True]
         [Expert Info (Error/Checksum): Bad checksum]
             [Message: Bad checksum]
             [Severity level: Error]
             [Group: Checksum] 

I sometimes get these when I offload checksumming to the hardware and the hardware twiddles the bits in the packet during the checksum validation. Or something. In Debian, you can do the following:

$ sudo apt-get install ethtool $ sudo ethtool -k eth0 # or whatever interface this capture is from

details:

http://sandilands.info/sgordon/segmentation-offloading-with-wireshark-and-et...

I'll be monitoring.

KF7BMP