Cisco 2600 router and Telnet
Marc Powell
mpowell at ena.com
Fri May 2 03:29:49 CEST 2003
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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