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How to speed up auto-discovery?

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I have to scan a class B network with a lot of unreachable ip address.

How can I speed up scanning (by lowering both retry count and timeout)?

auto-discovery speedup timeout

Created on Mar 27, 2019 12:02:15 PM by  MaxFactorPlus (0) 1



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If the device is not pingable at all, it will immediately move on. Did you already start the scan and observed slowdowns? There are 65,536 possible addresses in a class B network, it may take some time to iterate through it. One could also create multiple groups reflecting the various subnets using PRTGapi (see my signature) and discovery them seperately.


PRTGapi | Feature Requests | WMI Issues | SNMP Issues

Kind regards,
Stephan Linke, Tech Support Team

Created on Mar 27, 2019 1:30:48 PM by  Stephan Linke [Paessler Support]



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Yes, I started it yesterday. I used Autodiscovery with Template, by choosing only ping. Most ip address are not used, but unfortunately the subnet is really a /16 one. After many many hours (maybe 12?) it only reached 57%.

What does mean the following "13 seconds" delay between logs?

2019-03-27 16:19:14.114313 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:19:14: Bulk Ping; Group ID: 5365; 
FOUND: 0Devices

2019-03-27 16:19:27.551840 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:19:27: Bulk Ping; Group ID: 5365; 
FOUND: 0Devices

2019-03-27 16:19:40.536259 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:19:40: Bulk Ping; Group ID: 5365; 
FOUND: 0Devices

2019-03-27 16:19:53.114405 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:19:53: Bulk Ping; Group ID: 5365; 
FOUND: 0Devices

2019-03-27 16:20:06.130034 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:20:06: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:20:19.583191 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:20:19: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:20:32.051963 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:20:32: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:20:45.051977 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:20:45: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:20:58.130138 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:20:58: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:21:11.114526 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:21:11: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:21:24.536443 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:21:24: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:21:37.052077 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:21:37: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:21:50.067739 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:21:50: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:22:03.130265 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:22:03: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:22:16.114667 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:22:16: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:22:29.114702 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:22:29: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:22:42.130347 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:22:42: Bulk Ping; Group ID: 5365; FOUND: 0Devices

2019-03-27 16:22:55.536612 INFO TId    1640 CoreAutoDiscovery> 27/03/2019 16:22:55: Bulk Ping; Group ID: 5365; FOUND: 0Devices

Thanks

Created on Mar 27, 2019 3:25:42 PM by  MaxFactorPlus (0) 1

Last change on Mar 27, 2019 7:16:31 PM by  Stephan Linke [Paessler Support]



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This is indeed going to take a while, 11 days to be precise, if my math adds up. How about a different approach. Use something like this instead, create working devices only and start an autodiscovery on them?

# add the new device to the group with the template
$Group = Get-Group -Id <id of group> 
# run Get-DeviceTemplate to get a list of templates
$Group | Add-Device -Name "$address" -Host "<a-test-server-that-is-pingable>" -Template "Generic Device (Ping Only)" -AutoDiscover 

You could run the script every day via scheduled tasks instead of using the auto discovery, which ...well...doesn't scale properly here :D


PRTGapi | Feature Requests | WMI Issues | SNMP Issues

Kind regards,
Stephan Linke, Tech Support Team

Created on Mar 27, 2019 7:25:54 PM by  Stephan Linke [Paessler Support]



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