that's very clever indeed ! Well, I was not quite sure it was
actually performing the TCO (not to say I feel stupid ...).
not very important but wouldn't it be better to set the checksum
to 0 instead of some arbitrary (?) and confusing value then ?
thank you anyway,
Roman.
Kris Kennaway wrote:
On Thu, Jan 18, 2007 at 03:34:46PM +0100, Roman Le Houelleur wrote:
Hi everyone,
It's been about a year or so that I upgrade my box to RELENG_6
from time to time. I got some suprises this week, I've seen a
few things that made me think of hardware problems but some are
definitly soft.
First and easy one, tcpdump -v does not show checksum error
for UDP whereas it does for TCP (same w/ tcpdump -vvv).
checksum : I have a double port fxp 82550 Pro/100 board which
makes plenty of checksum errors (UDP & TCP), I suspect this
is related to checksum offloading but am not sure. I strongly
believe this card was working fine a few days/weeks ago.
And a priori it still is: by definition, checksum offload means that
the OS does not compute the checksum for outgoing packets, so tcpdump
doesn't see a valid checksum either. Unless you have evidence (from
e.g. observation on another host) that the checksums are not being
computed correctly, this is not a bug. It is, however, a FAQ ;-)
Kris
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