XOT and Sockets (X25 over TCP/IP)

XOT and Sockets (X25 over TCP/IP)

[Jacque Andre' Bussey]

Greetings all,

I am presented with a situation that requires that I monitor 200 Telco 
switches via X.25. My problem is that my monitoring platform
is on TCP/IP. I know that with Cisco routers you can map a X.121 address to 
an IP but does that mean I can make a TCP/IP connection to that device? If 
not, is there any software that I can run on a Unix box that can map a 
Socket back to that device over TCP/IP? (a listener on the Unix box gets a 
connection then forwards that via X.25 encapsulated in TCP/IP to the far 
side X.25 on the other side of the XOT cisco router. *WHEEEW*)


Any help will be greatly appreciated ,


Jacque Bussey

Re: XOT and Sockets (X25 over TCP/IP)

[Ashwin Mansinghka]

Hi Jack,

I am also in a similar situation.

Infact I also need to do file transfer between Linux and Maintenance 
Terminals of the switches using FTAM.

I am all lost right now.

I was looking for some free source OSI stack and drivers (Linux) for any 
PCI based X.25 cards.

I also need suggestions on which hardware to choose.

All help is welcome.

with Regards,
ASHWIN

Jacque Andre' Bussey wrote:

> Greetings all,
>
> I am presented with a situation that requires that I monitor 200 Telco 
> switches via X.25. My problem is that my monitoring platform
> is on TCP/IP. I know that with Cisco routers you can map a X.121 
> address to an IP but does that mean I can make a TCP/IP connection to 
> that device? If not, is there any software that I can run on a Unix 
> box that can map a Socket back to that device over TCP/IP? (a listener 
> on the Unix box gets a connection then forwards that via X.25 
> encapsulated in TCP/IP to the far side X.25 on the other side of the 
> XOT cisco router. *WHEEEW*)
>
>
> Any help will be greatly appreciated ,
>
>
> Jacque Bussey
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-x25" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: XOT and Sockets (X25 over TCP/IP)

[Ian Cass]

Hi,

We've got 2 different X25 implementations here.

The first uses a Cisco router and a Linux XOTd & the 2nd uses a Cyclades X25
card.

For the XOT, the cisco router has been configured to tunnel X25 inside TCPIP
with a Linux box as the local endpoint. This uses the userland XOT daemon
written by Stephane Fillod <sfillod@charybde.gyptis.frmug.org>. I'm not sure
where I downloaded it from, but I suggest you do a search for it on the net.
If you can't find it, I can mail it to you.

The XOTd will terminate the XOT tunnel, unwrap the X25 and present it to the
Linux X25 stack. In our case, the far end x25 host was an SMSC and I wanted
our internal applications to talk to it via TCP rather than X25, so I made a
TCP<>X25 proxy. This makes the far end X25 host look like a TCP service
running on a local server. If you can't find or make a similar application,
I can probably mail this to you too. No promises on code quality though :)

The XOTd worked pretty much out of the box. It's running on Linux v2.2.19. I
had to modify the Linux X25 stack slightly in order to fix a facilities bug,
but other than that it works great.

--- net/x25/old_af_x25.c        Wed Nov 28 18:37:15 2001
+++ net/x25/af_x25.c    Thu Nov 29 12:33:50 2001
@@ -1150,7 +1150,7 @@
                                return -EINVAL;
                        if (facilities.winsize_in < 1 ||
facilities.winsize_in > 127)
                                return -EINVAL;
-                       if (facilities.throughput < 0x03 ||
facilities.throughput > 0x2C)
+                       if (facilities.throughput && (facilities.throughput
< 0x03 || facilities.throughput > 0x2C))
                                return -EINVAL;
                        if (facilities.reverse != 0 && facilities.reverse !=
1)
                                return -EINVAL;

--
Ian Cass

----- Original Message -----
From: "Jacque Andre' Bussey" <retsam@prodigy.net>
To: <linux-x25@vger.kernel.org>
Sent: Wednesday, June 19, 2002 10:39 PM
Subject: XOT and Sockets (X25 over TCP/IP)


> Greetings all,
>
> I am presented with a situation that requires that I monitor 200 Telco
> switches via X.25. My problem is that my monitoring platform
> is on TCP/IP. I know that with Cisco routers you can map a X.121 address
to
> an IP but does that mean I can make a TCP/IP connection to that device? If
> not, is there any software that I can run on a Unix box that can map a
> Socket back to that device over TCP/IP? (a listener on the Unix box gets a
> connection then forwards that via X.25 encapsulated in TCP/IP to the far
> side X.25 on the other side of the XOT cisco router. *WHEEEW*)
>
>
> Any help will be greatly appreciated ,
>
>
> Jacque Bussey
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-x25" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: XOT and Sockets (X25 over TCP/IP)

[Bernd Jendrissek]

On Thu, Jun 20, 2002 at 09:33:45AM +0100, Ian Cass wrote:
> The XOTd worked pretty much out of the box. It's running on Linux v2.2.19. I
> had to modify the Linux X25 stack slightly in order to fix a facilities bug,
> but other than that it works great.
> 
> --- net/x25/old_af_x25.c        Wed Nov 28 18:37:15 2001
> +++ net/x25/af_x25.c    Thu Nov 29 12:33:50 2001
> @@ -1150,7 +1150,7 @@
>                                 return -EINVAL;
>                         if (facilities.winsize_in < 1 ||
> facilities.winsize_in > 127)
>                                 return -EINVAL;
> -                       if (facilities.throughput < 0x03 ||
> facilities.throughput > 0x2C)
> +                       if (facilities.throughput && (facilities.throughput
> < 0x03 || facilities.throughput > 0x2C))
>                                 return -EINVAL;
>                         if (facilities.reverse != 0 && facilities.reverse !=
> 1)
>                                 return -EINVAL;

[I'm a total idiot with regards to X.25; please excuse my ignorance.]

When is facilities.throughput ever set to 0?  The only place I can find is in
net/x25/x25_facilities.c

What does facilities.throughput == 0 mean anyway?  X25_DEFAULT_THROUGHPUT?
No change?

bernd

BTW 2.4.18 has 0xDD instead of 0x2C - I guess that just allows higher
throughput.

Re: XOT and Sockets (X25 over TCP/IP)

[Ian Cass]

> When is facilities.throughput ever set to 0?  The only place I can find is
in
> net/x25/x25_facilities.c

Because some (possibly broken) German X25 networks do not support that
particular facility. It's been a long time since I actually coded this
stuff, but it made sense back then and fixed our problem in a way
non-detrimental to other uses.

--
Ian Cass

RE: XOT and Sockets (X25 over TCP/IP)

[Dermot Smith]

I was looking at this very same issue yesterday for a customer but they
couldn't use the "translate" command you mentioned because (as stated in the
Cisco document you linked to) it is only available in the ENTERPRISE edition
of IOS software on the 2600 series and above making it a very expensive
solution for them.

Regards

Dermot Smith

Jacque, Ashwin: if you are still looking for a PCI X.25 card, do take a look
at our range which have drivers included as standard for 2.2 and 2.4 series
kernels: www.farsite.co.uk.

-----Original Message-----
From: Lange, Harald [mailto:Harald.Lange@t-systems.com]
Sent: 20 June 2002 08:00
To: retsam@prodigy.net; linux-x25@vger.kernel.org
Subject: AW: XOT and Sockets (X25 over TCP/IP)

Hello Jaque,

the Cicso router has a 'translate' command.
see: http://www.cisco.com/warp/public/133/x25_tcptrans.html

When you connect the router with the appropriate destination address, the
cisco will perform a X.25 connect to the X.25 system. We did this with a
Cisco 2600 and everything worked well.

This may possibly solve your problem.


Best Regards

Harald Lange

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-----Ursprungliche Nachricht-----
Von: Jacque Andre' Bussey [mailto:retsam@prodigy.net]
Gesendet: Mittwoch, 19. Juni 2002 23:39
An: linux-x25@vger.kernel.org
Betreff: XOT and Sockets (X25 over TCP/IP)


Greetings all,

I am presented with a situation that requires that I monitor 200 Telco
switches via X.25. My problem is that my monitoring platform
is on TCP/IP. I know that with Cisco routers you can map a X.121 address to
an IP but does that mean I can make a TCP/IP connection to that device? If
not, is there any software that I can run on a Unix box that can map a
Socket back to that device over TCP/IP? (a listener on the Unix box gets a
connection then forwards that via X.25 encapsulated in TCP/IP to the far
side X.25 on the other side of the XOT cisco router. *WHEEEW*)


Any help will be greatly appreciated ,


Jacque Bussey

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