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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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