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SubjectRe: e1000, sshd, and the infamous "Corrupted MAC on input"
On Wed, Feb 02, 2005 at 10:44:14PM -0500, Ethan Weinstein wrote:
> Hey all,
> I've been having quite a time with the e1000 driver running at gigabit
> speeds. Running it at 100Fdx has never been a problem, which I've done
> done for a long time. Last week I picked up a gigabit switch, and that's
> when the trouble began. I find that transferring large amounts of data
> using scp invariably ends up with sshd spitting out "Disconnecting:
> Corrupted MAC on input." After deciding I must have purchased a bum
> switch, I grabbed another model.. only to get the same error.
> Finally, I used a crossover cable between the two boxes, which resulted
> in the same error from sshd again.

Well ssh isn't an especially good test as it's hard to debug.

Try transferring large compressed files via netcat and comparing the
results. eg:

host1# nc -l -p 2000 > foo.bz2
host2# nc host1 2000 < foo.bz2

If the md5sums differ, follow up with a cmp -bl to see what changed.

Then we can look at the failure patterns and determine if there's some
data or alignment dependence.

Mathematics is the supreme nostalgia of our time.
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