Cisco AUX to Console Reverse Telnet
Physical Set Up[*] Use a standard Cisco console cable or create a cable with the following DB9 to RJ-45 connections.
[*] Connect the rollover UTP cable to the router A AUX port and DB9 connector to the router B's console port.
[*] Proceed to the router configuration in the next section.
RJ-45 Adapter Pinouts to DB9 DCE (non-modem)
From Cisco A AUX port to Router B (or other standard DB9 console port) using straight UTP cable
AUX Port
RJ45 Pinouts
Color
Assignments
DCE Style (non-modem) DB9 Pinouts
Assignments
1
Blue
RTS(out)
8
CTS (Clear To Send)
2
Orange
DTR(out)
6
DSR (Data Send Ready)
3
Black
TX+(out)
2
RXD
4
Red
TX-
5
GND
5
Green
RX-
5
GND
6
Yellow
RX+(in)
3
TXD
7
Brown
DSR(in)
4
DTR (Data Terminal Ready)
8
White/Grey
CTS
7
RTS (Ready-To-Send)
Router Configuration
1. Determine the line number for the AUX port on your router.
For example:
# sh line
Tty Line Typ Tx/RxA Modem Roty AccO AccI Uses Noise Overruns Int
00 CTY -- --- 0 00/0 -
11 AUX9600/9600 - inout --- 0 00/0 -
*194 194 VTY -- --- 3 00/0 -
195 195 VTY -- --- 0 00/0 -
196 196 VTY -- --- 0 00/0 -
197 197 VTY -- --- 0 00/0 -
198 198 VTY -- --- 0 00/0 -
2. Define a loopback for reverse Telnet and IP host using TTY number from Step 1.
ip host rtsh1 2001 10.10.10.1
!
interface Loopback0
ip address 10.10.10.1 255.255.255.255
3. Setup aux 0 for reverse telnet.
line aux 0
modem InOut
no exec
transport input all
transport output all
stopbits 1
4. Telnet to the router loopback interface and port. (2000 + Aux line number)
For example: telnet 10.10.10.1 2001
Referance:
https://splash.riverbed.com/thread/3128
https://supportforums.cisco.com/thread/46652
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