Well I'm definitely willing to believe this is a hardware error but at
this point it is wholly bewildering to me.  I'll have to try new sticks
of ram though I'm reluctant to believe that is the issue as the single
stick of 4gig ram which is in the machine has the correct voltages and
timings which it is rated for and it has made it through 16 consecutive
passes of Memtest86+ v4.20.

I decided to try and really track down this issue to no avail.  I have
changed NICs twice now, I have removed my cheap NVIDIA video card (which
put me back on the ATI 4250 built onto the motherboard). I have also
disabled the use of the "hidden cores" on my AMD64 cpu.  None of this
has changed the corruption I'm seeing, which is frequently 0xAA
sprinkled randomly throughout the packet.  Once right at the beginning
0xAAxxAAxx  where xx are random (normally either 0x55 or random) (this
is always the first part).

I think my next step here is going to have to be trying this in two different 
scenarios:
1) I will be to take the server to a different house and see if I get the same 
corruption problem (this would rule out my router/wiring as being the issue)
2) Actually get new RAM for the machine (though I'm currently too broke to 
afford it, it will have to wait)

I guess I'm hoping that someone can provide a method of ruling out
software/kernel/driver issues.  As it stands I'm trying more and more
elaborate hardware-based solutions but I haven't had any good method of
ruling out non-functioning software.

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https://bugs.launchpad.net/bugs/60764

Title:
  Large file transfer gives error: Corrupted MAC on input

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