[c-nsp] XMODEM transfer over telnet/ssh, any chance?

[Tomas Daniska]

Or just for fun, you can use two routers and create an aux-to-aux tunnel over ssh/telnet, so you can use the serial port on your PC as if the device was local to you ;-)

--

deejay


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Peter Rathlev
> Sent: Wednesday, December 15, 2010 9:00 AM
> To: cisco-nsp
> Subject: [c-nsp] XMODEM transfer over telnet/ssh, any chance?
> 
> Anybody know of a way to make XMODEM work over telnet/ssh? For a Sup720
> stuck in ROMMON that is. I know it's almost always much faster to just
> get a CF card with the right image, but this problem has me
> interested. :-)
> 
> I'm connecting remotely ("reverse telnet") to the AUX port of some 1841.
> The AUX port is connected to the console port of a Sup720, and this
> Sup720 is placed in ROMMON.
> 
> The connection works fine for "telnet" purposes, no problems there. But
> when I try to initiate an XMODEM transfer, every block of data is
> NAK'ed.
> 
> I'm using expect to connect and start the transfer, letting lszrz do the
> transfer itself. The two (ROMMON/lszrz) can see each other fine. Console
> initiates the transfer correctly with the first NAK after some time, but
> every block that lszrz then sends is also NAK'ed.
> 
> I suspect the path isn't 8-bit clean and some kind of translation screws
> things up. I just can't see why that *has* to be.
> 
> List of things I tried with no luck:
> 
> 1) Read http://puck.nether.net/pipermail/cisco-nsp/2005-July/022358.html
> 
> 2) Probably all combinations of Sup720 flags and lszrz flags. In my head
>    it should work with "xmodem -c <file.bin>" and "sx -q <file.bin>",
>    but it doesn't.
> 
> 3) Many many AUX line options: "telnet transparent", "escape-character
>    NONE", all to no avail.
> 
> 4) Many combinations of flags for telnet, "-8", "-e ''", "-E", "-L", you
>    name it...
> 
> 5) SSH as transport instead of telnet.
> 
> 6) Several combinations of "non default" line parameters: The Sup720
>    should use 8 data bits, 1 stop bit and no parity bits.
> 
> Should I just give up? Even though this would be way cool to make
> work? :-D
> 
> --
> Peter
> 
> 
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