python telnet client response how to decode it

[globantt]

 python telnet client response how to decode it  I think it is a specific response as all cisco servers have the same response . What is the name of this text and how do I decrypt it '\xff\xfb\x01\xff\xfb\x03\xff\xfd\x18\xff\xfd\x1f'   import socket import sys HOST = 'xxx.xxx.xxx.xxx' # this is my cisco server ip PORT = 23 import socket import gzip s = socket.socket() #Connecting using telnet s.connect((HOST,23)) a = s.recv(10000) print(str(a)) #'\xff\xfb\x01\xff\xfb\x03\xff\xfd\x18\xff\xfd\x1f'

[bigevilbeard]

It's a series of bytes that tell the client and server what features they want to enable for the connection.

Decoding the Bytes:

• \xff: This byte marks the start of a Telnet command.
• \xfb: This byte indicates the "WILL" option, meaning the server is proposing to enable a feature.
• \x01: This byte signifies the Echo option. With Echo enabled, the server will send back whatever it receives from the client.
• \x03: This byte represents the Suppress Go Ahead (SGA) option. When enabled, the server won't send a "Go Ahead" character (usually a CR or \r) after receiving a command from the client.
• \xfd: This byte marks the start of a Telnet subnegotiation (used for options with additional parameters).
• \x18: This byte specifies the Echo character (typically a CR or \r).
• \x1f: This byte signifies the Erase character (usually a backspace or BS).

In simpler terms:

• The server is proposing to enable Echo, meaning it will echo back what the client sends.
• The server also suggests disabling the "Go Ahead" signal after commands.
• The server defines the Echo character (carriage return) and Erase character (backspace) if these options are negotiated.

Hope this helps.

[Ruben Cocheno]

@globantt 

Try to use netmiko