I've a networking problem using Linux kernel 2.1.103, compiled for SMP and
using SMP: It won't connect to ftp.kernel.org. My network link is a very
busy ISDN line with a round trip time of about 4 seconds(!). I've noticed
this problem only with ftp.kernel.org, connections to other servers are not
very fast, but no problem.
Compiled in network features are: IPv6, IPv4, large Windows, no source
routed frames. I'm using a WD8013 network card.
To give an impression of my network link:
python:~#ping -a inet ftp.kernel.org
PING ftp.kernel.org (206.184.214.34): 56 data bytes
64 bytes from 206.184.214.34: icmp_seq=0 ttl=240 time=4566.42 ms
64 bytes from 206.184.214.34: icmp_seq=1 ttl=240 time=4302.89 ms
64 bytes from 206.184.214.34: icmp_seq=2 ttl=240 time=4065.2 ms
64 bytes from 206.184.214.34: icmp_seq=3 ttl=240 time=3168.96 ms
[and so on]
Very slow, but no losses. A TCP connection should work... I ran 'ncftp
ftp.kernel.org':
tcpdump tells me (just added a few linefeeds):
python:~# tcpdump host ftp.kernel.org
14:24:07.206547 python.wohnheim.uni-ulm.de.1114 > linux.kernel.org.ftp:
S 85727615:85727615(0) win 31856 <mss 1460,sackOK,timestamp 1701016 0,
nop,wscale 0> (DF)
14:24:10.197859 python.wohnheim.uni-ulm.de.1114 > linux.kernel.org.ftp:
S 85727615:85727615(0) win 31856 <mss 1460,sackOK,timestamp 1701316 0,
nop,wscale 0> (DF)
14:24:11.573002 linux.kernel.org.ftp > python.wohnheim.uni-ulm.de.1114:
S 4240735359:4240735359(0) ack 85727616 win 31856 <mss 1460,sackOK,
timestamp 40912065 0,nop,wscale 0> (DF)
14:24:11.573254 python.wohnheim.uni-ulm.de.1114 > linux.kernel.org.ftp:
. ack 1 win 31856 <nop,nop,timestamp 1701453 40912065> (DF)
14:24:11.582760 linux.kernel.org.ftp > python.wohnheim.uni-ulm.de.1114:
. ack 1 win 31856 <nop,nop,timestamp 40912102 1701016> (DF) [tos 0x10]
14:24:13.547741 linux.kernel.org.ftp > python.wohnheim.uni-ulm.de.1114:
. ack 1 win 31856 <nop,nop,timestamp 40912355 1701316> (DF) [tos 0x10]
14:24:14.311683 linux.kernel.org.ftp > python.wohnheim.uni-ulm.de.1114:
. ack 1 win 31856 <nop,nop,timestamp 40912402 1701316> (DF) [tos 0x10]
14:24:15.666549 linux.kernel.org.ftp > python.wohnheim.uni-ulm.de.1114:
. ack 1 win 31856 <nop,nop,timestamp 40912511 1701453> (DF) [tos 0x10]
14:25:05.732392 linux.kernel.org.ftp > python.wohnheim.uni-ulm.de.1114:
. ack 1 win 31856 <nop,nop,timestamp 40917528 1701453> (DF) [tos 0x10]
[.. other console and a 'killall ncftp']
14:25:13.555511 python.wohnheim.uni-ulm.de.1114 > linux.kernel.org.ftp:
F 1:1(0) ack 1 win 31856 <nop,nop,timestamp 1707651 40917528> (DF) [tos 0x10]
After state "ESTABLISHED" according to netstat, "python" doesn't like to talk
any further to ftp.kernel.org. But what's the reason for this?
Thanks for your help.
Regards
Carsten
-- unzip ; touch ; finger ; mount ; gasp ; yes ; umount ; sleep Carsten Gross Internet: carsten@sol.wohnheim.uni-ulm.de Wohnheim Heilmeyersteige: Sebastian Kneipp Weg 6, 89075 Ulm
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