[c-nsp] Cisco Console access server

[Peter Rathlev]

On Thu, 2010-07-29 at 18:58 +0530, venkat wrote:
> Not sure, if i am posting on the right thread.
> Is there any way to change the default (reverse) telnet port number
> on Cisco console access server (2500 series)? Checked some Cisco doc
> and it doesn't help.
> 
> For eg;
> 
> "telnet <console access ip> 2001" connects to the console of the
> device connected to port 1. For some reason, the device has to assume
> the base port# starts from 10000.... say, " telnet <console access ip>
> 10001" should connect to console connected to the 1st port. is there
> any way to make this change?

I don't know of any way to change to default port, but you can manually
make lines available at one ther specific TCP port with "rotary"
configuration. If your goal is simple to use another port, that might
help.

The "alternative" ports are:

+----------------------+---------------+-------------------+
|                      | Base TCP Port | Base TCP Port for |
| Services Provided    | for Rotaries  | Individual Lines  |
+----------------------+---------------+-------------------+
| Telnet protocol      | 3000          | 2000              |
+----------------------+---------------+-------------------+
| Raw TCP protocol (no | 5000          | 4000              |
| Telnet protocol)     |               |                   |
+----------------------+---------------+-------------------+
| Telnet protocol,     | 7000          | 6000              |
| binary mode          |               |                   |
+----------------------+---------------+-------------------+
| XRemote protocol     | 10000         | 9000              |
+----------------------+---------------+-------------------+

The configuration (and the table) is described here:
http://www.cisco.com/en/US/docs/ios/12_1t/12_1t1/feature/guide/dtasyncq.html

If you need a truly custom port you would need some kind of NAT
configuration. That should be possible, albeit very ugly.

-- 
Peter