Faddom has the ability to map your physical devices, both routers, and switches. This map is static and it is recommended that when you wish to view it, you rerun the discovery which is done via SNMPv2. To read more about SNMP please see our blog post What is SNMP?
To create the topology map please do the following -
- To access the screen go to Maps > Network Topology Map
- Click on Settings
- Enter all the relevant details in the dialogue that appears
Community String - It comprises the user credential—ID or password—delivered alongside a GET request. By default Faddom has public and private, you can remove these and/or add other strings in its place.
Proxy - The proxy to use to perform the discovery. This will only show if you are using multiple proxies.
Port - This is the port used for discovery. By default this is the standard SNMP port of 161
SNMP Timeout - This is the amount of time to wait to receive a response from an SNMP device in seconds. Some devices, especially older ones, can take some time to respond so if you don't see the expected result try a higher timeout value.
Range Scan - The range of IP addresses to scan for network devices. It is possible to enter a list of IP addresses or subnets in CIDR format (which can be divided by either spaces, commas or semicolons). If not specified, Faddom will use the default gateway defined for the server to start the discovery from
Ping Scan - When selected, the network discovery will try to scan by pinging each IP address. This should reduce the time required to scan. In networks where ping is not available, this should be disabled.
Search Adjacent Devices - When selected, the network discovery will also attempt to scan devices that are detected to be communicating with each network device. Will increase scan time.
- Click on Run Discovery at the bottom
- When the discovery scan has finished, you will get a map that looks similar to the one below
In the map, you can see the following information -
Device Name -this is the name used by the device to identify itself on the network
Numbers -each connection will show the interface number for the connection on each device
IP Address -This is the IP address identified via the scan of the device. Devices may have more than one IP address and you can view the device details..
View Device Details
To view more details on each device you can click left click. You will see details, as below, including the device name, software version, all IPs associated with the device, interfaces in use, and any configured routes.
- Up - The link is working and sending/receiving traffic
- Down - The link is now working/not detected
- Not Present - The interface has missing components preventing the detection of the status. Typically this is missing hardware.
If you do not see any results in the network map, check the following:
- Make sure that the address that is used responds to SNMP requests
- Check the firewall rules to make sure that the Faddom server can send SNMP requests to the gateway
- Check that the correct community strings are entered
- Ensure Faddom is authorized on any ACLs
- If you are not seeing all your devices, try a higher timeout value. We recommend between 5 and 10 seconds as some older devices take time to respond.
- On some devices, the Faddom server needs to be added to a whitelist so that they will respond to SNMP requests from it.
For any other questions, please contact us at firstname.lastname@example.org