v2.6.8.1 breaks tspc

v2.6.8.1 breaks tspc

[Christian Hesse]

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Hello!

Kernel version 2.6.8.1 breaks tspc (Freenet6's Tunnel Server Protocol Client). 
It tries to connect to the server but waits forever. No problems with 2.6.7, 
booted the old kernel and it worked perfectly.

Any ideas?

Please CC.

-- 
Christian

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Re: v2.6.8.1 breaks tspc

[ismail dönmez]

On Sat, 21 Aug 2004 23:02:58 +0200, Christian Hesse <mail@earthworm.de> wrote:
> Hello!
> 
> Kernel version 2.6.8.1 breaks tspc (Freenet6's Tunnel Server Protocol Client).
> It tries to connect to the server but waits forever. No problems with 2.6.7,
> booted the old kernel and it worked perfectly.
> 
> Any ideas?
> 

I can confirm the same problem here with 2.6.8.1-mm3 and 2.6.8.1

Cheers,
ismail

-- 
Time is what you make of it

Re: v2.6.8.1 breaks tspc

[Christian Kujau]

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Hash: SHA1

Christian Hesse wrote:
> Hello!
>
> Kernel version 2.6.8.1 breaks tspc (Freenet6's Tunnel Server Protocol
Client).
> It tries to connect to the server but waits forever. No problems with
2.6.7,
> booted the old kernel and it worked perfectly.

aha, and i thought freenet6's tunnel server has problems again.
reproduceable here with 2.6.8(.1), 2.6.7 was working indeed.
ipv6 module is loaded, the tspc client does not give much information of
what it is doing. maybe strace help here:

socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
connect(4, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")}, 28) = 0
send(4, "\363\t\1\0\0\1\0\0\0\0\0\0\5tsps2\10freenet6\3net\0"..., 36, 0)
= 36
gettimeofday({1093126256, 233665}, NULL) = 0
poll([{fd=4, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
ioctl(4, FIONREAD, [128])               = 0
recvfrom(4,
"\363\t\201\200\0\1\0\1\0\1\0\2\5tsps2\10freenet6\3net\0"..., 1024, 0,
{sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")}, [16]) = 128
close(4)                                = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 4
connect(4, {sa_family=AF_INET, sin_port=htons(3653),
sin_addr=inet_addr("206.123.31.115")}, 16) = 0
write(4, "VERSION=1.0.1\r\n", 15)       = 15
read(4,
[...and then read() waits until the of the world as we know it]


Christian,
(searching for a free tunnel-broker in .de anyway...)

- --
BOFH excuse #370:

Virus due to computers having unsafe sex.
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Re: v2.6.8.1 breaks tspc

[Christian Hesse]

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On Sunday 22 August 2004 00:16, Denis Vlasenko wrote:
> On Sunday 22 August 2004 00:02, Christian Hesse wrote:
> > Hello!
> >
> > Kernel version 2.6.8.1 breaks tspc (Freenet6's Tunnel Server Protocol
> > Client). It tries to connect to the server but waits forever. No problems
> > with 2.6.7, booted the old kernel and it worked perfectly.
> >
> > Any ideas?
>
> What do you see with tcpdump on both 2.6.7 and 2.6.8.1?

In the config file I've changed template from linux to checktunnel. With 
kernel 2.6.7 it shows all the options it receives from the server. With 
2.6.8.1:

root@noname:~# tspc -f /etc/freenet6/tspc.conf -vvv
tspc - Tunnel Server Protocol Client

Loading configuration file

Connecting to server

[now waits until Ctrl-c]

A log of strace can be found at
http://linux.eworm.net/tspc_strace.log
-- 
Christian

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Re: v2.6.8.1 breaks tspc

[Christian Hesse]

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On Sunday 22 August 2004 16:43, Denis Vlasenko wrote:
> [...]
> Looks like window scaling is not understood or incorrectly
> handled by Linux or by remote box. I am no expert on this,
> thus CCing LKML and netfilter list.
>
> Please try whether it works whan you do
> "echo 0 > /proc/sys/net/ipv4/tcp_window_scaling"

That helps. Thanks so far.

> [...]
-- 
Christian

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Re: v2.6.8.1 breaks tspc

[Anders Fugmann]

Christian Hesse wrote:
> On Sunday 22 August 2004 16:43, Denis Vlasenko wrote:
> 
>>Please try whether it works whan you do
>>"echo 0 > /proc/sys/net/ipv4/tcp_window_scaling"
> 
> 
> That helps. Thanks so far.
Any explanation of why this solution works?

I hate to blindly just disable window_scaling, just to make tspc work on 
2.6.8.1.

Is this a bug in the tscp program, netfilter or the tcp stack (or none 
of the mentioned)? One easy conclution is that some change were made 
between 2.6.7 and 2.6.8.1 which made tspc break - The question is which 
change and what other effect this change has.

Regards
Anders Fugmann

Re: v2.6.8.1 breaks tspc

[Tomasz Torcz]

On Mon, Aug 23, 2004 at 12:48:02PM +0000, Anders Fugmann wrote:
> Christian Hesse wrote:
> >On Sunday 22 August 2004 16:43, Denis Vlasenko wrote:
> >
> >>Please try whether it works whan you do
> >>"echo 0 > /proc/sys/net/ipv4/tcp_window_scaling"
> >That helps. Thanks so far.
> Any explanation of why this solution works?
> 
> I hate to blindly just disable window_scaling, just to make tspc work on 
> 2.6.8.1.

 http://lwn.net/Articles/92727/
 
-- 
Tomasz Torcz               "Never underestimate the bandwidth of a station 
zdzichu@irc.-nie.spam-.pl    wagon filled with backup tapes." -- Jim Gray