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    Subject[BUG] TCP connections between Linux and NT
    [1.] One line summary of the problem:

    TCP connections between Linux and NT slows down very much (on a local

    [2.] Full description of the problem/report:

    Any kind of TCP connections between a Linux (2.2.10) and a NT Server 4
    (Service Pack 5) slow down to a crawl.

    [3.] Keywords (i.e., modules, networking, kernel):


    [4.] Kernel version (from /proc/version):

    Linux version 2.2.10 (root@hip) (gcc version #4 Wed Jul 7
    11:26:27 EEST 1999

    [5.] Output of Oops.. message (if applicable) with symbolic information
    resolved (see Documentation/oops-tracing.txt)


    [6.] A small shell script or example program which triggers the
    problem (if possible)

    A classical FTP sessions suffices to trigger the problem.

    [7.] Environment

    The Linux server and the NT 4 (SP5) server are connected via a
    (moderately loaded) 10MBps (twisted pair, non-switching hub) network. I
    have attached the tcpdump of a FTP sessions from NT to Linux when the
    network was idle. The tcpdump command line was:
    tcpdump host hip and kobold and port ftp-data > kobold1

    [7.1.] Software (add the output of the ver_linux script here)

    -- Versions installed: (if some fields are empty or looks
    -- unusual then possibly you have very old versions)
    Linux hip 2.2.10 #4 Wed Jul 7 11:26:27 EEST 1999 i586 unknown
    Kernel modules 2.1.121
    Gnu C egcs-2.91.66
    Linux C Library 5.4.46
    Dynamic linker ldd: version 1.9.9
    Linux C++ Library 2.9.0
    Procps 2.0.2
    Mount 2.7l
    Net-tools 1.52
    Kbd 0.94
    Sh-utils 1.16
    Modules Loaded ppp_deflate ne2k-pci 8390 ppp slhc

    [7.2.] Processor information (from /proc/cpuinfo):

    processor : 0
    vendor_id : AuthenticAMD
    cpu family : 5
    model : 8
    model name : AMD-K6(tm) 3D processor
    stepping : 0
    cpu MHz : 332.704505
    fdiv_bug : no
    hlt_bug : no
    sep_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 1
    wp : yes
    flags : fpu vme de pse tsc msr mce cx8 sep mmx 3dnow
    bogomips : 663.55

    [7.3.] Module information (from /proc/modules):

    ppp_deflate 40612 1 (autoclean)
    ne2k-pci 3780 2
    8390 6212 0 [ne2k-pci]
    ppp 19884 3 [ppp_deflate]
    slhc 4268 1 [ppp]

    [7.4.] SCSI information (from /proc/scsi/scsi)


    [7.5.] Other information that might be relevant to the problem
    (please look in /proc and include all information that you
    think to be relevant):
    [X.] Other notes, patches, fixes, workarounds:

    No workarounds known. I can provide more details and/or make further tests
    if necessary.

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