22 Feb
2012
22 Feb
'12
12:51 p.m.
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-e…
I'll be monitoring.
KF7BMP