Nagios Support Forum

I am trying to setup NagiosXI to be able to query devices using SNMPv3 instead of SNMPv1/2c. Is there anything you have to do on the NagiosXI server to get this to work? Do I need to setup a user? I have entered a username, authentication password and privacy password on the device (APC environmental monitor) and attempted to do a walk but it just states that no results were returned. When I attempt to do a walk using SNMPv1 it works as normal.

Any help is appreciated!

Just to update, I have been able to get SNMPv3 to work if I set the authentication and privacy protocol to none (noauthnopriv) yet when I try to add a authentication passphrase if fails.

Are you getting any specific errors, could you post the output from a working and not working command please?

I just want to follow up regarding setting up SNMP v3 in NagiosXI (2012R2.9). I believe this is what I had to to do in order to set this up:

- Open the following file in your favorite text editor: /var/lib/net-snmp/snmpd.conf
Such as: nano /var/lib/net-snmp/snmpd.conf

- Add the following line to the end of the file:
createUser <UserName> <AuthenticationProtocol> <AuthenticationPassword> <PriviledgedProtocol> <PrivacyPassword>
createUser guest_user MD5 "Pass0001" DES "sharedkey001"

- Restart the snmpd service
service snmpd restart

After restarting the service, when you open the /var/lib/net-snmp/snmpd.conf file, you will notice that the line that was added will be removed. At this point I believe you will need to use the snmpusm command (use Google for more info) to edit the user settings.

- Open /etc/snmp/snmpd.conf
nano /etc/snmp/snmpd.conf

- Add the following line to the end of the file:
authuser read -s usm <UserName> priv .1
authuser read -s usm guest_user priv .1

- Try to run snmpget to see if valid output is returned:
snmpget -v 3 -u <UserName> -l <SecurityLevel> -a <AuthenticationProtocol> -A <AuthenticationPassword> -x <PrivacyProtocol> -X <PrivacyPassword> <IPAddressOfSystemToMontior> <ValueToRetrieve>
snmpget -v 3 -u guest_user -l AuthPriv -a MD5 -A Pass0001 -x DES -X sharedkey001 192.168.56.31 sysName.0

The above worked for me, following the instructions: http://honglus.blogspot.com/2011/03/set ... ption.html. I am not sure whether there is other ways to complete this, as I am still learning. If someone else has an additional way, or better way, please let me know. Also I had issues with having non-alphanumeric characters in the passwords (!, @, $, etc.) and the length appears to have to be over a certain length (15?).

Be sure to backup your config files before attempting this! I still need to see this will work form SNMP Traps

Hope this helps someone else who is not a Linux expert! It would be nice if the Nagios Team would write up a tutorial on this as it requires additional work beyond the NagiosXI web interface to make operational

Good job, that looks pretty correct to me! We might get into snmpv3 documentation soon, but for now its still a surprisingly small amount of the snmp support requests we get. It is growing though!