Subject: Fw: [Bug 79891] New: Router causes TCP retransmits for windows hosts after "ip_forward: fix inverted local_df test"

From: Stephen Hemminger <[email-masked]>
Date: Thu, 10 Jul 2014 06:44:33 -0700

Begin forwarded message:

Date: Thu, 10 Jul 2014 06:20:14 -0700
From: "[email-masked]" <[email-masked]>
To: "[email-masked]" <[email-masked]>
Subject: [Bug 79891] New: Router causes TCP retransmits for windows hosts after "ip_forward: fix inverted local_df test"

https://bugzilla.kernel.org/show_bug.cgi?id=79891

            Bug ID: 79891
           Summary: Router causes TCP retransmits for windows hosts after
                    "ip_forward: fix inverted local_df test"
           Product: Networking
           Version: 2.5
    Kernel Version: 3.2.60
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IPV4
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

Created attachment 142651
  --> https://bugzilla.kernel.org/attachment.cgi?id=142651&action=edit
TCP retransmissions from a windows host

After upgrading a router to Linux 3.2.60 most windows machines behind it
started experiencing connection stalls. Downgrade to 3.2.59 resolved the
problem. Using git bisect I pinpointed it to
"59d9f389df3cdf72833d5ee17c3fe959b6bdc792 is the first bad commit", which
entered the kernel from here
http://marc.info/?l=linux-netdev&m=139949081418806&w=2

No connection problems for Linux hosts at all – only windows. Please, find
attached tcpdump packet capture demonstrating the bad behaviour.

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