Cisco 2600 router and Telnet

[Brad Dunn]

Just so we all don't get into a "Why on Earth do u worry about Telnet on a
2600 router", Telnet is extreamly important for some scripted tools and
things, but in a nut shell it needs to work. I imagine there are places even
where manual ACL updates happen every day, and if telnet dies, and your
router is like interstate or something, it might cause some problems :D.


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

-----Original Message-----
From: Jamie Baddeley [mailto:jamie.baddeley at vpc.co.nz] 
Sent: Friday, 2 May 2003 10:57 AM
To: Marc Powell; Brad Dunn; nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Cisco 2600 router and Telnet


ahh, but what if one is doing telnet checks to establish reachability of the
device instead of ping checking....

hmmm. catch 22.
----- Original Message -----
From: "Marc Powell" <mpowell at ena.com>
To: "Brad Dunn" <Brad at pretzel.com.au>; <nagios-users at lists.sourceforge.net>
Sent: Friday, May 02, 2003 1:29 PM
Subject: RE: [Nagios-users] Cisco 2600 router and Telnet


> 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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