Disable ECHO on the TELNET session.

Hello, all!

I have a certain task to execute commands sent over the TCP/Telnet connection of my apps on a Cisco device. So I would decline/stop any output as a response to the entry. I tried to use IAC DO GA and WHOSE ECHO, but it looks like the device are ignore it at all.

Any notice or what I need to check but in addition?

An illustration of what I'm doing in the apps:

Establish a TCP connection to the Cisco device

Received: ' FD FF FF FF FD 18 FF 1F FB FB 01 03 "Cisco device

Envoy: NT$ CMD_IAC, CMD_DO$ TN, TN$ OPT_GA.

CMD_IAC$ TN, TN$ CMD_WILL, TN$ OPT_ECHO.

CMD_IAC$ TN, TN$ CMD_WILL, TN$ OPT_TTYPE.

CMD_IAC$ TN, TN$ CMD_WILL, TN$ OPT_NAWS.

CMD_IAC$ TN, TN$ CMD_SB, TN$ OPT_NAWS, 132, 0, 0, 42,.

CMD_IAC$ TN, TN$ CMD_SE.

CMD_IAC$ TN, TN$ CMD_WONT, TN$ OPT_XDLOC.

CMD_IAC$ TN, TN$ CMD_WONT, TN$ OPT_NEWENV.

CMD_IAC$ TN, TN$ CMD_WONT, TN$ OPT_ENV, 13, 10,.

CMD_IAC$ TN, TN$ CMD_SB, TN$ OPT_TTYPE, 0, 'P', 'C', 'F', ' / ', ', 'R', 'V', ' / ', 'P' 'd', OF ', 'N',

CMD_IAC$ TN, TN$ CMD_SE.

/*

* Following the responses to the ciscoiacs

*/

CMD_IAC$ TN, TN$ CMD_DO, TN$ OPT_GA.

CMD_IAC$ TN, TN$ CMD_DONT, TN$ OPT_ECHO.

CMD_IAC$ TN, TN$ CMD_WONT, TN$ OPT_ECHO.

XMIT 100 bytes BG7159 44:50.29: 172.16.0.45,14333-> 89.253.0.8,23

ESTBLSHD SEQ = ACK D = 60 2266844313 = 1780728895 W = CTL = HSP 61440! ACK

DATA = FF FD FF FB FF FB FF FB FF 1F 18 01 03 FA 00 1F *... *.

84 2A 00 FF F0 FF FF 23 CF 27 FF CF 24 CF 0D 0A *... *... #.. '... $.. *

FF FA 18 00 50 43 46 44 52 56 50 44 53 2F 2F 4TH *... FCP/DRV/IHDP *.

F0 FF FF FD 03 FF FE FF 01 FC 01

Sent after the login sequence:

44:51.29 49 XMIT bytes BG7159: 172.16.0.45,14333-> 89.253.0.8,23

ESTBLSHD SEQ = ACK D = 9 2266844395 = 1780728981 W = CTL = HSP 61440! ACK

DATA = FF FD FF 03 FC 01 FF FE 01 *... *.

44:51.49 RCVD 40 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780728981 D = 0 ACK = 2266844404 W = 4037 CTL = ACK

And nothing coming back. After the show:

XMIT 86 bytes BG7159 49:19.24: 172.16.0.45,14333-> 89.253.0.8,23

ESTBLSHD SEQ = 2266844578 D = 46 ACK = 1780729359 W = CTL = HSP 61440! ACK

DATA = 43 4 45 41 52 20 43 44 4 D 41 20 50 44 20 53 4F * CLAIRE CDMA IHDP *.

53 45 53 53 49 4F 4 20 4 53 49 44 20 32 35 30 * SESSION MSID 250 *.

30 39 39 30 31 33 35 31 35 30 36 34 0D 0 * 099013515064... *

I don't want to receive following:

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729359 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=43                                              *C*

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729360 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=4C                                              *L*

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729361 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=45                                              *E*

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729362 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=41                                              *A*

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729363 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=52                                              *R*

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729364 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=20                                              * *

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729365 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=43                                              *C*

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

ESTBLSHD SEQ = 1780729366 D = 1 ACK = 2266844624 W = 3817 CTL = HSP. ACK

DATA=44                                              *D*

49:19.24 RCVD 41 bytes BG7159: 89.253.0.8,23-> 172.16.0.45,14333

...

Cisco IOS-server telnet does not support negotiations ECHO. This is a bug.

Tags: Cisco Network

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