Submit a ticketCall us

Get a crash course on Network Monitoring delivered right to your inbox
This free 7-day email course provides a primer to the philosophy, theory, and fundamental concepts involved in IT monitoring. Lessons will explain not only how to perform various monitoring tasks, but why and when you should use them. Sign up now.

Home > Success Center > Network Topology Mapper (NTM) > Network Topology Mapper (NTM) Documentation > NTM Administrator Guide > Specify subnets

Specify subnets

Updated: April 10, 2017

Discover nodes by the subnet to which they belong.

An address range that includes more than 2000 nodes takes much longer (one to two days, for example) to discover than the same number of nodes split up into multiple smaller ranges. With many nodes on a map, the user interface and NTM operations may run with noticeable lag.

Discover devices by subnets

  1. Click the Subnets tab, and click Add a New Subnet.
  2. Enter a Subnet Address and a Subnet Mask.
  3. To add additional subnets repeat steps 2 and 3.
  4. If you have finished specifying your discovery nodes, ranges and subnets, click Next.

Discover devices by seed device

Save time by querying a device (a core switch) that is central to your network and creating a list of subnets to scan.

  1. Click the Subnets tab.
  2. Click Add a Seed Device.
  3. Enter the IP Address of the seed device, and then click Add.
  4. When the discovery engine populates the Subnet dialog, select the subnets to be removed from discovery, and then click Remove Selected.
  5. If you only want to discover these subnets, click Next.
  6. If you want to specify other devices by IP address range, or as a free- form set of hostnames and addresses (in either IPv4 or IPv6 networks), click the IP Ranges or Free-form IPs tab.
  7. If you want to exclude devices from the subnets you have defined, click Do-Not-Scan List.
Last modified
06:35, 10 Apr 2017

Tags

Classifications

Public