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Cisco Employee

Netmiko SSH jump box server

I’m trying to implement a Python script to collect to some outputs from Switches and routers. My problem is that I need to go through a proxy server. The flow is like this:

 

Personal Mac ----1-----> jumpbox ----2----> Nexus SW

 

Step 1:
- Authentication via SSH Key and password

 

Step 2:

- Authentication via username/password

 

I’m using SSH File config, as below. Using this SSH File, I can connect to the jumphost so I don’t think the issue is on the first step:

 

host VPS
  IdentityFile <keyfile>
  user <username>
  hostname <IP>
  port 22

host * !VPS                # Use the SSH proxy for all endpoints
  ProxyCommand ssh VPS nc %h %p

 

When I try to connect to a switch using the script below, I’m getting the error below it:

 

<PYTHON SCRIPT>

from netmiko import ConnectHandler
from getpass import getpass
import logging

logging.basicConfig(filename='test.log', level=logging.DEBUG)
logger = logging.getLogger("my_log")
logger.debug('This message should go to the log file')

device = {
    'device_type': 'cisco_ios',
    'host': 'HOST',
    'username': '<device username>',
    'password': '#######,
    'ssh_config_file': 'ssh_config.txt',
    'global_delay_factor': 4
}

net_connect = ConnectHandler(**device)
output = net_connect.send_command("show users")
print(output)

 

/usr/local/bin/python2.7 "/Users/zammes/PycharmProjects/Network Automation/proxy_test.py"
Traceback (most recent call last):
  File "/Users/zammes/PycharmProjects/Network Automation/proxy_test.py", line 19, in <module>
    net_connect = ConnectHandler(**device)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/netmiko/ssh_dispatcher.py", line 190, in ConnectHandler
    return ConnectionClass(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/netmiko/base_connection.py", line 245, in __init__
    self.establish_connection()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/netmiko/base_connection.py", line 738, in establish_connection
    self.remote_conn_pre.connect(**ssh_connect_params)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/paramiko/client.py", line 392, in connect
    t.start_client(timeout=timeout)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/paramiko/transport.py", line 545, in start_client
    raise e
paramiko.ssh_exception.SSHException: Error reading SSH protocol banner

Process finished with exit code 1

 

Is there someone that could help me with it?

Everyone's tags (2)
1 REPLY 1
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Beginner

Re: Netmiko SSH jump box server

It's a bit of an old post but I randomly popped into it.

 

1). Can you ssh into this 'HOST' from the same machine? Is the DNS resolving properly? If not, just use IP address as this error indicates that you simply cant get there. 

 

2). Why are you using 2.7? It's 2019 (well you posted it in 2018) get onto 3.x ;)

 

3). There is a special method to get onto terminal server using netmiko 

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