From: Giovanni Cardone <g_cardone@libero.it>
To: netfilter@lists.samba.org
Subject: Re: ip_conntrack_ftp doesn't work
Date: Wed, 26 Jun 2002 02:17:42 +0200 [thread overview]
Message-ID: <20020626021742.A316@rainbow> (raw)
In-Reply-To: <Pine.LNX.4.33.0206251200261.4927-100000@blackhole.kfki.hu>; from kadlec@blackhole.kfki.hu on Tue, Jun 25, 2002 at 12:03:24PM +0200
On Tue, Jun 25, 2002 at 12:03:24PM +0200, you wrote:
> But were there any 'partial' FTP requests detected by the module
> according to the kernel log?
The only place I know to look in is /proc/net/ip_conntrack(I hope you are
talking about this now...). For example, when I do :
darkstar\$ ftp 195.210.93.14
it looks like :
darkstar\$ cat /proc/net/ip_conntrack
tcp 6 431998 ESTABLISHED src=151.26.68.170 dst=195.210.93.14 sport=1052
dport=21 src=195.210.93.14 dst=151.26.68.170 sport=21 dport=1052 [ASSURED]
use=1
EXPECTING: proto=6 src=195.210.93.14 dst=151.26.68.170 sport=0 dport=1053
In the iptables logs I see :
Jun 26 01:51:59 darkstar kernel: ip_tables: (C) 2000-2002 Netfilter core team
Jun 26 01:51:59 darkstar kernel: ip_conntrack (511 buckets, 4088 max)
Jun 26 01:52:19 darkstar kernel: +SYN IN=ppp0 OUT= MAC= SRC=195.210.93.107
DST=151.2 6.68.170 LEN=60 TOS=0x08 PREC=0x00 TTL=58 ID=33120 DF PROTO=TCP
SPT=20 DPT=1053 WINDOW=32120 RES=0x00 SYN URGP=0
But now it comes for me the strange part...
Now I tried to do ftp to another server, ftp.unina.it. Passive FTP now it
seems to work.
After I logged in the server, I tried the ls command and it works. To be sure
about the fact that I was using Passive mode, I did :
darkstar\# tcpdump port 20
02:01:26.828426 192.132.34.17.ftp-data > 151.26.68.170.1061: S
1536506260:1536506260(0) win 32768 <mss 1460,nop,wscale 0> (DF)
02:01:26.828491 151.26.68.170.1061 > 192.132.34.17.ftp-data: S
4196382663:4196382663(0) ack 1536506261 win 5840 <mss 1460,nop,wscale 0> (DF)
and so on like those two. So a data channel was opened...
But if I do :
darkstar\# lsmod | egrep 'ftp'
ip_conntrack_ftp 3120 0 (unused)
ip_conntrack 13264 2 [ipt_state ip_conntrack_ftp]
it shows unused, but it's working I believe...
The proc file system :
darkstar\# cat /proc/net/ip_conntrack
tcp 6 117 TIME_WAIT src=192.132.34.17 dst=151.26.68.170 sport=20
dport=1067 src=151.26.68.170 dst=192.132.34.17 sport=1067 dport=20 [ASSURED]
use=1
tcp 6 431997 ESTABLISHED src=151.26.68.170 dst=192.132.34.17 sport=1066
dport=21 src=192.132.34.17 dst=151.26.68.170 sport=21 dport=1066 [ASSURED]
use=2
udp 17 12 src=151.26.68.170 dst=193.70.192.25 sport=1027 dport=53
src=193.70.192.25 dst=151.26.68.170 sport=53 dport=1027 use=1
That's all I know at this time. I'm really new to Netfilter :( Is there other
I can do to provide more info about my situation? Let me know please.
Thanks
next prev parent reply other threads:[~2002-06-26 0:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-14 17:42 ip_conntrack_ftp doesn't work Giovanni Cardone
2002-06-24 19:16 ` Adam Young
2002-06-24 19:30 ` Antony Stone
2002-06-25 9:23 ` Giovanni Cardone
2002-06-25 8:52 ` Jozsef Kadlecsik
2002-06-25 9:27 ` Allowing limited broadcasts between LAN <-> DMZ? Chris
2002-06-25 11:42 ` Antony Stone
2002-06-25 9:31 ` ip_conntrack_ftp doesn't work Giovanni Cardone
2002-06-25 10:03 ` Jozsef Kadlecsik
2002-06-26 0:17 ` Giovanni Cardone [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-06-14 17:42 Giovanni Cardone
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