Frequently Asked Questions (FAQ)

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OpManager

  • Why can't I add performance monitors via Rule Engine?Performance monitors can be added only via device templates. It is the current design. We have plans to enhance it as "monitoring profile" in future so it can be applied via Rule Engine.
  • Make it sense to use layer2 discover without CDP?We can do it by LLDP based discovery but for Cisco CDP is recommended.
  • What is the role of this seed router?OpManager will query the seed device(mostly core switch with SNMP) and get all the neighbor devices to plot the layer 2 map.
  • Does REST API work with FreshService?REST API is for OpManager. Since the APIs are open, any third party tool can integrate with it, provided that third party tool has an option to call OpManager APIs. http://help.opmanager.com/rest_api
  • If you have a notification profile associated with say the category Servers, and a new server is added after the profile was associated. Will the new server automatically be added to the notification profile that was previously associated with the category Servers, or will it need to be added manually?We can do it by Rule Engine. Please refer this link for more info about rule engine. http://help.opmanager.com/rule_engine_api-v12
  • What will happen if we have virtual devices in a cluster. How we can be sure that we will monitor the devices even in the case that it moves to different physical computers of the cluster?If the IP/DNS of the VM is the same while moving , OpManager will continue to monitor it.
  • Imagine I want to skip all the windows pc when I discover network devices, my list shows unknown category?Use discovery filter to exclude all windows devices by choosing ignore filter -> device type contains as 'Windows' and choose one more ignore filter for Unknown.
  • How I can discover and monitor only critical interface of switch like uplink or ten gigabit interface?We have an option to filter based on interface type like 'Ethernet' now and we will provide more filter like 10G interfaces soon.
  • How to rediscover IP address in network devices?Choose existing devices option in Network discovery and choose the devices based on category.
  • Can I modify DomainController category?Yes, You can change the category in device snapshot page.
  • How shall i discover cisco l2 switch?Yes, if any device that responds to SNMP we can add this in OpManager by giving proper SNMP credentials. If there is no exact device template for this then please refer this link to create custom device template for the same. http://help.opmanager.com/device_templates_api
  • Is there any site, where i can see the custom made templates publically?Yes, check it here. https://resources.manageengine.com/resources/forum/opmanager/device-templates
  • What happens if I accidentally delete VMwareVirtualMachine template or some monitor of it, then how do I re-add the monitor or the entire template?You can import this template using import option. Please click export this option under device template. It's present before delete button in demo.opmanager.com. http://demo.opmanager.com/apiclient/ember/index.jsp#/Settings/Configurations/DeviceTemplate
  • Can a device be added, just for the ability to ping test, without SNMP or WMI. I have vendor devices on my network, that I do not have SNMP or WMI on. I just need to to Ping these devices?Yes. It is possible. Please discover the device & OpManager will do an ICMP ping periodically and update the device status.

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OpManager

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OpManager

Why can't I add performance monitors via Rule Engine?

Performance monitors can be added only via device templates. It is the current design. We have plans to enhance it as "monitoring profile" in future so it can be applied via Rule Engine.

Make it sense to use layer2 discover without CDP?

We can do it by LLDP based discovery but for Cisco CDP is recommended.

What is the role of this seed router?

OpManager will query the seed device(mostly core switch with SNMP) and get all the neighbor devices to plot the layer 2 map.

Does REST API work with FreshService?

REST API is for OpManager. Since the APIs are open, any third party tool can integrate with it, provided that third party tool has an option to call OpManager APIs. http://help.opmanager.com/rest_api

If you have a notification profile associated with say the category Servers, and a new server is added after the profile was associated. Will the new server automatically be added to the notification profile that was previously associated with the category Servers, or will it need to be added manually?

We can do it by Rule Engine. Please refer this link for more info about rule engine. http://help.opmanager.com/rule_engine_api-v12

What will happen if we have virtual devices in a cluster. How we can be sure that we will monitor the devices even in the case that it moves to different physical computers of the cluster?

If the IP/DNS of the VM is the same while moving , OpManager will continue to monitor it.

Imagine I want to skip all the windows pc when I discover network devices, my list shows unknown category?

Use discovery filter to exclude all windows devices by choosing ignore filter -> device type contains as 'Windows' and choose one more ignore filter for Unknown.

How I can discover and monitor only critical interface of switch like uplink or ten gigabit interface?

We have an option to filter based on interface type like 'Ethernet' now and we will provide more filter like 10G interfaces soon.

How to rediscover IP address in network devices?

Choose existing devices option in Network discovery and choose the devices based on category.

Can I modify DomainController category?

Yes, You can change the category in device snapshot page.

How shall i discover cisco l2 switch?

Yes, if any device that responds to SNMP we can add this in OpManager by giving proper SNMP credentials. If there is no exact device template for this then please refer this link to create custom device template for the same. http://help.opmanager.com/device_templates_api

Is there any site, where i can see the custom made templates publically?

Yes, check it here. https://resources.manageengine.com/resources/forum/opmanager/device-templates

What happens if I accidentally delete VMwareVirtualMachine template or some monitor of it, then how do I re-add the monitor or the entire template?

You can import this template using import option. Please click export this option under device template. It's present before delete button in demo.opmanager.com. http://demo.opmanager.com/apiclient/ember/index.jsp#/Settings/Configurations/DeviceTemplate

Can a device be added, just for the ability to ping test, without SNMP or WMI. I have vendor devices on my network, that I do not have SNMP or WMI on. I just need to to Ping these devices?

Yes. It is possible. Please discover the device & OpManager will do an ICMP ping periodically and update the device status.

Will it monitor an exchange/Office 365 hybrid environment?

OpManager can to Exchange servers. For Office 365 monitoring, we recommend APM plugin. https://www.manageengine.com/products/applications_manager/office-365-monitoring.html

Is file monitoring only available for Windows?

Yes. Since it is limited to WMI, it is available only for Windows.

Nutanix runs in a CentOS environment, would it be able to monitor that?

We can monitor if it responds to SNMP OID. As per the Nutanix Portal, we can configure SNMP and add few metrics. Please refer this video and contact support for further assistance.

What is exactly total traffic for an interface ? Is it the total traffic from the specific point in time until another point in time?

It is based on the polling interval. If Interface polling interval is 15 mins, then the last polled value is the traffic in between the two consecutive polls.

How can I know the total amount of traffic through an interface from time 1 to time 2 ? Is there a report?

You can choose the time period in reports and pull the data based on this.

Is it possible to make a script run from a specific device instead of the monitoring server and I'm talking here about Microsoft windows devices?

For Windows devices, script has to be executed locally but there is are workarounds like psexec(third party) or an option in Powershell where a block of code can be executed on a remote server. This psexec or Powershell script might run locally on windows server but it can call the remote script or run the block of code on a remote server. https://pitstop.manageengine.com/portal/kb/articles/how-to-run-commands-on-remote-machines-using-pstools

What should I do when I discover a vCenter and in "virtual details" it shows the esxi host, but it doesn't start monitoring automatically? DNS records are correct. How can I force start monitoring it? Rediscovering vCenter, deleting and readding vCenter also doesn't help.

Yes it won't help, as DNS name is not updated so deleting and rediscovery will again do the same thing. But if do update the dnsname then in the next scheduled discovery of vCenter, it will automatically start monitoring the corrected ESXServer.


If you correct the DNS Records it would be great, but in case its not correct you can force start monitoring by going to vCenter snapshot page -> Host List Widget and in the end there is Monitoring Column, from there on you can give IP and start monitoring it. Also, in our next releases we are going to do away with DNS Name dependency we are going to rely on the Entity Name only.

I have 6 ESX host, however one doesn't show up under Virtualization / VMware-Host. How do I add it to that section?

That section only shows the monitored ESX Server's. You can go to vCenter snapshot page and see the complete list of ESXServers mapped to that vCenter.

Why does SNMP write have to be enabled for IPSLA?

OpManager need to push the IPSLA settings on the network device using SNMP write.

What permissions are required by the vmware vcenter credentials?

HTTPs credential for VMware vCenter with ReadOnly Permission are enough to monitor vCenter.

What is the quickest/easiest way to identify against which IP or interface the DOS attack is against from my main router, I am also using your product netflow?

In NetFlow, you can see the source IPs in 'Offender' tab under attacks event drill down. You can see about the interface details under 'Field Details' tab (Unique IN interfaces and Unique OUT interfaces) under attacks event drill down.

What happens if the OpManager Server Hard Disk goes full, how can we free Space on Server?

NFA specific hard disk space usage reduction can be done by setting proper data retention period under Settings->NetFlow->Storage Settings.

Data retention period for Raw data , Aggregated data and One Min data can be set there.

If someone DOS attacks me, how can i see the network utilization in for example last 3 minutes to solve the problem quickly, not in last 1 hour. If I view it in last 1 hour then its very hard to notice the massive peak in my network.

- Note down the Offender IP and Interface name from attacks drill down.
- Go to Reports -> Custom Search Reports
- Select that interface and give the offender IP value for 'Source Address' criteria and select the desired time frame.
- Click 'Generate report'.
- If Raw data is enabled , then more detailed report can be seen under Reports -> Forensics Reports

What constitutes a license for a monitored device? i.e. = Physical Server / Virtual Host (HYPER-V)? –> Virtual Machines?

The license for a monitored Virtual Host or Virtual Machines are same as Physical Server. There is no difference in it. One Device - One License.

How can we monitor VPN connections in a Cisco ASA and create a view of this?

You can create your own monitors for SNMP-enabled devices, detailed steps are available in this link: http://help.opmanager.com/add_custom_monitors_api-v12

When using consecutive times, does it use the interval to check, or does it check more often if it is violated. Like CPU goes to 90 percent and threshold is 85 and the interval is 5 minutes. If I set consecutive times to 2, would that mean it would have to be above 85 for 10 minutes?

It is based on monitoring interval. Yes, that is correct. If you set consecutive times to 2, it would have to be above 85 for 10 mins.

How much traffic does this generate if we are looking at a more frequent time, like every minute so you could see if the spike lasts like 2 minutes instead of 10.

If it is within LAN, this traffic is negligible.

Can you make the failure component entry anything you want, or does it need to match something?

Anything. But, to have meaningful name, we recommend to combine both the trap processor name. $_Source_trapname1_Trapname2.

In setting up snmp traps on my netscaler, it is asking for a community string entry. Do I need something in there, or leave it blank or?

OpManager doesn't need SNMP string (authentication) for processing traps. You can leave it blank.

Where do I find unsolicited traps?

Alarms page --> Events --> Funnel filter --> Unsolicited traps

I have found that when the notification profile is created, missed poll set to 1, and criticial check it will not send a notification. As 1 missed poll is not critical. Is this not right?

Yes. It is configured to send for attention severity. 1 poll missed: attention, 3 poll missed: trouble, 5 poll missed= critical.

I would like to know if a server produces an 'unusually' high amount of any sort of error within a short period of time, say ten minutes. Is there a way to monitor if an event log records a set number of errors in a given time?
Example: Notify me if a OPManager records 500 errors within a 20 minute time period.

If it is eventlog or traps, then you can use 'Event Flood Notification' feature.

Does devices have to be configured in a certain way, for Event logs to go to OpManager?

No. There is no need to configure anything on the end device for event log monitoring.

My event log widgets show No data for all or specific device, is this okay?

Hope the event log is configured on the devices successfully. Please let me know if you wish to spare sometime with our technical team in a remote session. We will check this on a screen sharing session and help you fix this.

On the Netscaler it has public in there, when I clear it and save it, it still has public, will this block opmanager from getting the traps?

No. OpManager will process this trap.

How do I get opmanager to send notification if xenserver storage goes below a limit? For example, 100GB?

We need to configure the threshold in the template. If needed, we will send you the steps in email.

I cannot find VMware-Datastore template in my opmanager --> settings --> configuration --> device templates. Or do I need to configure each datastore separate?

VMware-HostSystem template will have the datastore related monitors. You can configure the threshold values and apply it to the required host machines.

Can you explain Seed Router?

Seed device is the Core switch or a Router which is SNMP enabled. Opmanager will query the seed device to know its neighbours.

What function is behind setting the business view for a report?

Business view is for grouping. It helps the user to get the report only for the devices in that group (business view).

Is it possible to present a report (result) on a dashboard or map? Or a Link to the report?

We can create a report and show it under widgets (inside dashboard).

Is it possible to create own reports to netflow data analysing?

Yes.

Is the traffic generated by this process significant on a LAN?

No. We will send you the exact traffic generated via mail.

Does OpManager automatically backup?

OpManager has a .bat/.sh file to take database backup. You can use Windows Scheduler or Linux cronjob to automate it. The backup will be stored under the OpManager installation folder.