[c-nsp] 2911 Terminal Server 8bits character problem

[Chubby]

Hi harold,

Is not me or the router that make a session. But the server behind.
The scenario is like this :
Terminal host <connect to asyn serial router> == router 2911 == <connect to switch>== solaris server

Because of old system terminal host can only talk using serial.
Server will initiate connection by telnet to router ie: telnet 10.10.10.10 2003
After connected they will start send received data. It all worked fine.

Sometime the terminal host Stop receiving data. After monitoring through wireshark and telescope (serial protocol analyzer)

The host did not received "0xFF" payload, which is through wireshark I capture the packet with 0xFF is sent through router.

Have u experience this before?

Best Regards,

Ranokarno


On Mar 25, 2011, at 10:19 PM, Harold 'Buz' Dale <buz.dale at usg.edu> wrote:

> Sure - Can you give me an overview of what you are doing exactly?  I must be slow this morning.  It seems as if you are telnetting to a router the reverse telnetting from line0/0/0 to some host.  When you try and shell out of the host and close the connection you end up at the router with the host still connected over the line0/0/0 because you couldn't escape the escape character? Clearing the line from the router still leaves the host hung?
> 
> Thanks,
> Buz
> 
> -----Original Message-----
> From: Chubby [mailto:chubby_cripth at yahoo.com] 
> Sent: Friday, March 25, 2011 9:10 AM
> To: Harold 'Buz' Dale
> Subject: Re: [c-nsp] 2911 Terminal Server 8bits character problem
> 
> Hi Dave,
> Thx but I don't think that'll solve the issue. 
> Is not about the telnet session, but more likely how to ensure the packet with 0xFF payload is transmitted to serial line.
> 
> Best Regards,
> 
> Ranokarno
> 
> On Mar 25, 2011, at 8:54 PM, Harold 'Buz' Dale <buz.dale at usg.edu> wrote:
> 
>> Try typing ctrl+shift+6 then ctrl+shift+6 then x and return in the telnet window. If you do this only once (ctrl+shift+6 then x return) it will shell you out higher on the tree.
>> Luck,
>> Buz
>> 
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Chubby
>> Sent: Thursday, March 24, 2011 10:11 PM
>> To: Andrew Gray
>> Cc: cisco-nsp at puck.nether.net
>> Subject: Re: [c-nsp] 2911 Terminal Server 8bits character problem
>> 
>> Hi Andrew,
>> 
>> This is a reverse telnet session that communicate using Serial <> TCP
>> 
>> 0xFF is part of data payload, and I can not find a way to double the content of payload ie: "0xFF 0xFF"
>> 
>> The config is:
>> Line 0/0/0
>> No exec
>> Exec-timeout 0 0
>> Data-character-bits 8
>> Exec-character-bit 8
>> Transport input all
>> Telnet transparent
>> Telnet refuse-negotiation
>> !
>> 
>> Best Regards,
>> 
>> Ranokarno
>> Powered by NCS
>> 
>> On Mar 25, 2011, at 2:48 AM, Andrew Gray <4457 at blargh.com> wrote:
>> 
>>> This sounds like you're telnet'ing in with something other than telnet - 0xFF is the Telnet escape character - it's expecting another control code after 0xFF to negotiate options and such.  To send a single 0xFF onward, you need to double it, i.e. 0xFF 0xFF. 
>>> Rano Karno writes: 
>>>> the issue is whenever server make a session to terminal host and sending "FF" hexa, it seem the router did not transmit it to terminal host, thus make the system hang.
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