Nagios Support Forum

Hi I have replaced a Linux Layer7 Device
Old Device Version 9 - Redhat 6
New Device Version 10 - CentOS7

I just replaced the systems New System has the exact same IP Address and Hostname and the Old system

The monitors that do not work all user the same perl script check_snmp_process_wizard.pl and all have the same Community Name, the only place I seen reference to this is in the
/etc/snmp/snmpd.conf file

So I copied the details and updated the snmp.conf file but the monitor still do not work

I have attached some screenshots

Can you shed some light on what I am missing

Thanks

Does the base snmpwalk command work? If not, it's likely being blocked by a firewall:
If that responds properly, try these:
If those don't return anything you likely need to edit the remote server's /etc/snmp/snmpd.conf file and change this:
To this:
Then restart snmpd and test again:

Hi Sean

I tried this command
snmpwalk -v2c -c 'EuLayer7Devive251' 172.16.45.251 system

On both the layer7 Device and from the nagios server and both servers returned
Timeout: No Response from 172.16.45.251

I have taken a look at the IPTables and the only difference I can see is the items in the attached screenshot


So sorry Sean not really sure what I need to do

Something is blocking it, you will need to reach out to your firewall/network/security admins and have them investigate. There isn't anything that we can do from our end on this.

Hi Sean
Thanks I understand.

Just a quick question do you know if this snmpwalk command work over a specific port or does it work over the standard nagios port 5666

Thanks

Hi @mccrakem,

SNMPWalk commands would communicate over port 161 using the UDP protocol. Let us know if you're able to determine what's blocking the connection.

Hi Ben
Got it all sorted Thanks for the info it helped me alot

Thanks

mccrakem wrote:Hi Ben
Got it all sorted Thanks for the info it helped me alot

Thanks

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