import telnetlib
import sys
import time

def open_telnet_conn(ip):
    username = 'python'
    password = 'python@18'
    T_port = 23
    T_timeout = 5
    R_timeout = 5

    connection = telnetlib.Telnet(ip, T_port, T_timeout)
    output = connection.read_until(b"ogin:", R_timeout)
    connection.write(username.encode('ascii')+b"\n")

    output = connection.read_until(b"word:", R_timeout)
    connection.write(password.encode('ascii')+b"\n")
    time.sleep(1)

    connection.write(b"\n")
    connection.write(b"get router info routing all\n")
    time.sleep(1)

    connection.write(b"\n")
    connection.write(b"exit \n")
    time.sleep(1)

    router_output = connection.read_very_eager()
    connection.close()