Monitoring Routers and Switches

[xmanhosting]

Hello,
 
I am attemping to set up: Monitoring Routers and Switches (nagios-3.pdf,
page 33)
 
It says:
 
"The check_snmp plugin will only get compiled and installed if you have the
net-snmp and net-snmp-utils
packages installed on your system. Make sure the plugin exists in
/usr/local/nagios/libexec before you
continue. If it doesn't, install net-snmp and net-snmp-utils and
recompile/reinstall the Nagios plugins."
 
check_snmp was not in my /usr/local/nagios/libexec folder, so I ran yum
install for 3 snmp files - that went fine.
 
I followed the rest of the instructions, verified my configuration (no
errors) and restarted Nagios.
 
Now in my web gui, it says:
 
PING OK  10-24-2009 08:08:13  0d 11h 3m 50s  1/3  PING OK - Packet loss =
0%, RTA = 1.01 ms 
Port 1 Bandwidth Usage UNKNOWN  10-24-2009 08:03:43  0d 11h 2m 20s  3/3
check_mrtgtraf: Unable to open MRTG log file 
Port 1 Link Status CRITICAL  10-24-2009 08:05:13  0d 11h 0m 50s  3/3
(Return code of 127 is out of bounds - plugin may be missing) 
Uptime CRITICAL  10-24-2009 08:06:43  0d 10h 59m 20s  3/3  (Return code of
127 is out of bounds - plugin may be missing) 
 
My questions are:
 
1. For the rror message: check_mrtgtraf: Unable to open MRTG log file -
Where should the MRTG log file be (using Centos5) ?
The objects/switch.cfg file says:
check_local_mrtgtraf!/var/lib/mrtg/192.168.1.253_1.log!AVG!1000000,1000000!5
000000,5000000!10 however there is no such folder at var/lib/mrtg/
 
2. I have read somewhere that for the "Port1 Link" and "Uptime" error, that
I maybe be missing files. I notice that there is still no check_snmp plugin
in the usr/local/nagios/libexec folder - is this the issue, and how do I get
it there?
 
Thanks for any help - I really appreciate it.
 
Kind regards,
Anthony
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