Re: Help with X.25 tests

Re: Help with X.25 tests

[Bahri Okuroglu]

First, you need to use slattach to set the line
discipline of the port, you're interested in, to X25.
After that you'll have a network interface like
x25asy0, which you should take up and set some routes.


In the kernel, LAPB is configured as DTE by default (
http://lxr.linux.no/source/net/lapb/lapb_iface.c#L135
and http://lxr.linux.no/source/include/net/lapb.h#L58
). If you need your box to act as DCE, you either need
to change this default behavior or enable the user to
be able to change it. 

I'm not an expert on these issues, but the code looks
like for testing issues as noted at the top of the
source code. For example it does not implement CRC and
does only byte stuffıng, not bit stuffing. Do you
know that Cisco can talk to it? 

Good luck,

> Jean-Francois Gobin <gobin@gobinjf.be> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hello all,
> 
> I'm trying to setup a X.25 connection between a
> Cisco and a linux box 
> through a serial port (Async /dev/ttyS0)
> 
> I'have the following configuration :
> 
> Cisco --Cisco Cable DCE--> Linux BOX
> 
> So, for now what I'm looking for is that I can't
> manage to even have my 
> interface set up in X.25.
> 
> I'm trying using x25_asy, but I didn't find where to
> specify the serial 
> line to use.
> 
> Help! Help! Help!
> 
> Regards,
> jF
> 
> - ----------
> Jean-Francois Gobin - Administrateur gobinjf.be
> http://www.gobinjf.be   mailto:gobin@gobinjf.be
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Re: Help with X.25 tests

[Jean-Francois Gobin]

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Hash: SHA1

I must miss something :

# lsmod

Module                  Size  Used by
x25                    61552  0
x25_asy                15088  0
lapb                   26097  1 x25_asy
ipv6                  371552  10
ohci_hcd               26428  0
usbcore               161452  3 ohci_hcd
cy82c693                6928  0
tulip                  71016  0
de4x5                  73904  0
crc32                   5376  2 tulip,de4x5
tsdev                  10216  0
evdev                  12664  0
psmouse                28824  0
ide_disk               26360  0
ide_cd                 56640  0
ide_core              175468  3 cy82c693,ide_disk,ide_cd
cdrom                  53920  1 ide_cd
ext3                  170448  3
jbd                    79992  1 ext3
sd_mod                 26985  9
qla1280               136448  0
scsi_mod              161000  2 sd_mod,qla1280
unix                   37640  46
font                    9224  0
tgafb                  23632  0
cfbcopyarea             7968  1 tgafb
cfbimgblt               4712  1 tgafb
cfbfillrect             6912  1 tgafb

# slattach -s 9600 -p x25 /dev/ttyS0
Cannot change line discipline to `x25'.





On Sat, 7 Jan 2006, Bahri Okuroglu wrote:



- ----------
Jean-Francois Gobin - Administrateur gobinjf.be
http://www.gobinjf.be   mailto:gobin@gobinjf.be
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Re: Help with X.25 tests

[Bahri Okuroglu]

Possibly there is some modified slattach to support
x25_asy, but I never could find it, and I did modified
it for my own purposes. 

Download the slattach code and put below in a file
(say x25asy.c) in the lib folder. Add your
x25asy_hwtype struct to the hw.c file also, and
re-build slattach. 

Mine version has a bit more code, to support DCE and
DTE operations, and below code is extracted from my
code and not compiled and not tested. FYI

--------------------------------
#include "config.h"


#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <linux/if_arp.h>
#include "lapb.h"
#include "support.h"
#include "pathnames.h"
#include "intl.h"
#define  EXTERN


/* Set the line discipline of a terminal line. */
static int
X25_set_disc(int fd, int disc)
{
  if (ioctl(fd, TIOCSETD, &disc) < 0) {
	fprintf(stderr, _("X25_set_disc(%d): %s\n"), disc,
strerror(errno));
	return(-errno);
  }
  return(0);
}


static int
do_x25(int fd)
{
  if (X25_set_disc(fd, N_X25) < 0) return(-1);
  return(0);
}


struct hwtype x25asy_hwtype = {
  "x25asy",	NULL, 		ARPHRD_X25,	0,
  NULL,		NULL,		NULL,		do_x25
};

---------------------------------------





--- Jean-Francois Gobin <gobin@gobinjf.be> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> I must miss something :
> 
> # slattach -s 9600 -p x25 /dev/ttyS0
> Cannot change line discipline to `x25'.
> 



		
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Re: Help with X.25 tests

[Jean-Francois Gobin]

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Hash: SHA1

Wow! Thanks for the code.

Other questions : what about xol and xot with linux ? I'm looking for some 
config, but can't find anything.

jF

- ----------
Jean-Francois Gobin - Administrateur gobinjf.be
http://www.gobinjf.be   mailto:gobin@gobinjf.be
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Help with X.25 tests

[Jean-Francois Gobin]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello all,

I'm trying to setup a X.25 connection between a Cisco and a linux box 
through a serial port (Async /dev/ttyS0)

I'have the following configuration :

Cisco --Cisco Cable DCE--> Linux BOX

So, for now what I'm looking for is that I can't manage to even have my 
interface set up in X.25.

I'm trying using x25_asy, but I didn't find where to specify the serial 
line to use.

Help! Help! Help!

Regards,
jF

- ----------
Jean-Francois Gobin - Administrateur gobinjf.be
http://www.gobinjf.be   mailto:gobin@gobinjf.be
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Comment: Made with pgp4pine 1.76

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=X64R
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