Find the right Management IP with SCANNER_SMART_IP_DISCOVERY
Often we heard from customers that most Discovery Solutions add their device with the wrong IP !!
It's good to know that the Slurp'it Device Discovery has therefor an build-in option (no license required) that will help you to detect the right management ip and ignore all others. To explain how this happens we need to dive in a little bit deeper in how the discovery works.
Why are devices detected with the wrong management ip ?
In short, it's kind of a mistake in the way your device configuration is designed. If you want a device to only respond on his Management IP then you should already limit this in the device configuration. Having a single mangement ip also makes it much easier if you have to limit access with an Firewall
Let's say your device has 3 interfaces:
Loopback 0
ip address 192.168.1.1
description management
Ethernet 1
ip address 172.16.2.3
description NOT management
Ethernet 2
ip address 10.3.2.1
description NOT management
If you don't configure that only Loopback0 can respond to SSH, Telnet or SNMP it basically makes all 3 interfaces a Management IP. Only for your documentation the Loopback 0 is the right one.
! interface Loopback0 ip address 192.168.1.1 255.255.255.255 ! ip access-list standard MGMT-SOURCES permit 10.9.9.0 0.0.0.255 # Management Subnet where slurpit server is ! line vty 0 4 login local transport input ssh access-class MGMT-SOURCES in ! snmp-server community YOURCOMMUNITY RO MGMT-SOURCES !
How does Slurp'its SCANNER_SMART_IP_DISCOVERY work ?
When a Device is detected it will run an Algorithm which will use multiple checks to verify what IP is configured as the right Management IP. Incase a Wrong ip is returned, first thing you have to verify in your DNS server is the IP that is connected to the Host record of your network device.
If this is not possible, then you can always turn off the feature.
- Open the docker-compose.override.yml file to find the Smart IP Discovery feature. By default it's turned on.
- Make the required changes
- Save the override file
- Restart the application by running sh down.sh && sh up.sh
services:
slurpit-scanner:
environment:
SCANNER_SMART_IP_DISCOVERY: true