[cisco-nas] reverse telnet on cisco 5850

[Aaron Leonard]

>002575: Aug 23 01:50:47.979 SAT: %TTY-3-AUTOCONFIG: TTY4/54: Modem auto-configuration failed
>
>  
>

Here's a hint: turn on "debug confmodem" then apply your modemcap to just
ONE line for starters.

>I am trying to reverse telnet to one of the modems above to see if my modem string might be causing the above error:
>
>vic-58-1#show controllers async 4/54
>Controller information for Async4/54 (TTY 1674), idb 0x64177C3C
>                                      ^^^^^^^^
> 
>
>vic-58-1#telnet 196.2.45.19 1674
>Trying 196.2.45.19, 1674 ...
>% Connection refused by remote host
>
>(assuming tcp 2000 as base port + 1674):
>vic-58-1#telnet 196.2.45.19 3674
>Trying 196.2.45.19, 3674 ...
>% Connection refused by remote host
>
>vic-58-1#telnet 196.2.45.19 2674
>Trying 196.2.45.19, 2674 ...
>% Connection refused by remote host
>
>vic-58-1#telnet 196.2.45.19 2074
>Trying 196.2.45.19, 2074 ...
>% Connection refused by remote host
>
>Any ideas?
>
>It seems that you can only telnet up to 2999...?
>  
>

Well, that's basically true.  The scheme involves telnetting to port 2000
+ line number ... so it breaks down with a line number > 999.

The workaround, if you REALLY need to telnet to a specific line that's
above 999, is to put it into a rotary, then telnet to port 3000+rotary

conf t
  line 1674
   rotary 11
  end

telnet 196.2.45.19 3011

>I also can't seem to find any Cisco documentation on reverse telnet on Cisco 58xx series - any pointers?
>  
>

Nothing specific on the AS5850 as the reverse telnet feature is a generic
one ... although to be sure the 5850 is one of the few boxes with line
numbers > 999. You might look at the "rotary" documentation,
http://www.cisco.com/en/US/products/sw/iosswrel/ps1826/products_command_reference_chapter09186a00800d9b6b.html#xtocid178229

Cheers,

Aaron

---

>thanks in advance,
>Jaco
>
>
>
>vic-58-1#sho ver
>Cisco Internetwork Operating System Software
>IOS (tm) 5850 Software (C5850-P9-M), Version 12.3(13a), RELEASE SOFTWARE (fc2)
>Technical Support: http://www.cisco.com/techsupport
>Copyright (c) 1986-2005 by cisco Systems, Inc.
>Compiled Tue 26-Apr-05 10:21 by ssearch
>Image text-base: 0x60008AF4, data-base: 0x61F50000
>
>ROM: System Bootstrap, Version 12.2(2r)XB5, RELEASE SOFTWARE (fc1)
>ROM: 5850 Software (C5850-BOOT-M), Version 12.3(13a), RELEASE SOFTWARE (fc2)
>
>vic-58-1 uptime is 1 hour, 22 minutes
>System returned to ROM by reload at 00:36:45 CAT Tue Aug 23 2005
>System restarted at 00:37:59 SAT Tue Aug 23 2005
>System image file is "disk0:c5850-p9-mz.123-13a.bin"
>Last reload reason: Reload command
>
>
>cisco c5850 (R7K) processor (revision 0.12) with 458752K/65536K bytes of memory.
>Processor board ID SAA06390089
>R7000 CPU at 259MHz, Implementation 39, Rev 3.3, 256KB L2, 2048KB L3 Cache
>Last reset from Mbus reset
>Channelized E1, Version 1.0.
>X.25 software, Version 3.0.0.
>Bridging software.
>SuperLAT software (copyright 1990 by Meridian Technology Corp).
>Primary Rate ISDN software, Version 1.1.
>1 FastEthernet/IEEE 802.3 interface(s)
>2 Gigabit Ethernet/IEEE 802.3 interface(s)
>744 Serial network interface(s)
>648 terminal line(s)
>24 Channelized E1/PRI port(s)
>507K bytes of non-volatile configuration memory.
>
>31360K bytes of Compact Flash card at slot 0 (Sector size 512).
>16384K bytes of Flash internal SIMM (Sector size 256k).
>Configuration register is 0x2102
>
>vic-58-1#
>
>  
>