[Bug 2467] New: point-to-point Tunnel doen't work since 6.8

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2467

            Bug ID: 2467
           Summary: point-to-point Tunnel doen't work since 6.8
           Product: Portable OpenSSH
           Version: 7.1p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: nerve at ipwar.ch

Since sshd version 6.8, point-to-point tunnels doesn't work as soon as
traffic through this tunnel ocures.

Steps to reproduce:
1. Use sshd > 6.7 on target server
2. open a point-to-point tunnel e.g. "ssh -w 10:10
targetserver.domain.org"
3. configure ip and link on tun10 on both sides
4. make some traffic, for example wget some file over the tunnel.
5. see the broken pipe

The debug log from client side is big, so i will upload it to the
message.

The relevant log file on the server side:
Sep 14 14:44:56 serverhost sshd[23455]: channel 0: adjust 99528
overflows remote window 4294869275

The point-to-point works fine if i downgrade the server to 6.7p1

Please fix this bug, as i need the point-to-point tunnel feature.

Thank you,
Daniel

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