Cisco 2600 router and Telnet

[Marc Powell]

Cisco's have a limited number of VTY's available for interactive network
sessions (5 I think). It seems to me that the router is waiting for the
connection that Nagios is making to result in an actual login and not
timing out properly if it doesn't. This isn't a Nagios specific issue as
I'll bet that if you repeatedly telnet'd to the port and immediately
dropped the connection a number of times you'd see the same behavior. If
it were me I would either a) look at upgrading the current running IOS
on that router to see if that corrected the issue or b) not do telnet
checks as a telnet failure on a Cisco router is an exceedingly rare
occurrence that doesn't usually affect any other services the router is
providing.

marc

-----Original Message-----
From: Brad Dunn [mailto:Brad at pretzel.com.au] 
Sent: Thursday, May 01, 2003 6:57 PM
To: 'nagios-users at lists.sourceforge.net'
Subject: [Nagios-users] Cisco 2600 router and Telnet

Hey there, I wasn't sure if this is the best place to send this, but I
thought id just see if there was anyone out there who had been involved
with
a similar issue.

In a nutshell all my nagios runs sweet without to many problems.
However,
the only thing I've noticed, is I have a check on telnet on a Cisco
2600.

This is what the check looks like.

[checkcommands.cfg]
# 'check_telnet' command definition
define command{
        command_name    check_telnet
        command_line    $USER1$/check_tcp -H $HOSTADDRESS$ -p 23
        }


[services.cfg]
# Service definition
define service{
        use                             generic-service         ; Name
of
service template to use

        host_name                       Cisco-2600
        service_description             PING
        is_volatile                     0
        check_period                    24x7
        max_check_attempts              3
        normal_check_interval           1
        retry_check_interval            1
        contact_groups                  router-admins
        notification_interval           240
        notification_period             24x7
        notification_options            c,r
        check_command                   check_ping!500.0,20%!700.0,60%
        }


Now my only problem, is that every now and then telnet just dies, and I
am
unable to login to the router remotely. Now before I was doing nagios
checks
every so often, back when I didn't use nagios, telnet has NEVER died. I
was
just wondering, is it at all possible that maybe the telnet sessions
aren't
being established or closed off properly or something like that?

If anyone has a better way to check the service as well id like to hear
it.

Thanks a lot.

b r a d  d u n n          
s y s t e m s  a d m i n i s t r a t o r
.  .  .

pretzelLogic 
Ph:  +61 8 9218 8588
Fax: +61 8 9218 8599
Lvl 9 256 adelaide tce perth wa 6000
http://www.pretzel.com.au


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::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null