This can be fixed by turning off TCP sequence reordering on the Cisco
appliance. Please note this also affects your Mac, BSD and Windows
machines. You can turn off SACK on your host if you don't care about
performance.
This feature was enabled by Cisco to protect Windows 95 hosts from TCP
I can reproduce this error too.
The environment is a full CISCO network with vmware ESXi hosts and ubuntu 14.04
guests.
Also here downloads to about 2MB are going somehow fine, but all which
is taking longer (or more MB to transfer) is dropping to a very low
bandwidth. Very often without any
** Changed in: linux (Ubuntu)
Status: Expired = In Progress
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https://bugs.launchpad.net/bugs/1388786
Title:
TCP stale transfer with erroneous SACK information
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete = Expired
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Packages, which is subscribed to linux in Ubuntu.
We have tested the kernel 3.19-rc7 and found some improvements.
Communication does not stop and the file can be finally downloaded, but
it still takes a long time.
We have tested a 100 MB file in an Ubuntu server with kernel 3.19-rc7 across
the Cisco firewall changing sequence numbers with
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.19 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
I can confirm this bug with the 3.13 kernel shipped with Ubuntu 14.04.
The 3.2 kernel shipped with Ubuntu 12.04 did not have the problem, all
download were succeeding. The problem started after upgrade to 14.04.
The problem also solved after downgrading the kernel to 3.2 by
downloading the latest
This link may also be related, it tells about same problems, but without
CISCO hardware: https://askubuntu.com/questions/475700/application-
stuck-in-tcp-retransmit/563984
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Ah, in that case you probably wanted to report a bug against the linux
package in Ubuntu. I'll move it across.
** Project changed: launchpad = linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Invalid = New
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** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1388786
Title:
TCP stale transfer with erroneous SACK information
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