Active Polling
- Viktoryia Varapayeva (Deactivated)
Active polling includes the following methods to identify addresses where devices are located:
Path Collection
Path collector tries to identify potential routers within a network (defined as a network object in Network Insight) by using traceroute to first, second, middle, and last addresses in it. For smaller networks that do not have that many addresses, a traceroute is performed to the manageable addresses in them.
If no routers are found, the path collector splits the network into two networks and repeats the process for smaller networks (up to four times). Path collection frequency is not configurable and traceroutes run every 30 minutes.
Complete Ping Sweep
Performs brute-force sweep on the network using a range of packets to detect the presence of a system on each IP in the network, using ports that are generally open.
Smart IPv4 Subnet Ping Sweep
Performs ping sweeps only on networks that are known to exist but no IPs can be found through ARP tables or other means.
Note
Ping sweeps are a tool to help in discovery. It is especially useful for the complete discovery of end-host network segments, but most discovery operations take place through ARP tables and routing tables are collected from infrastructure devices. Avoid using ping sweeps on a large number of networks or networks that are too large (more than a /22 in size) as devices discovered through this method may expire from Network Insight’s database before they are refreshed by another discovery cycle. Ping sweeps are not used on IPv6 networks because of the dramatically greater scale of network addresses in the IPv6 realm. Smart ping sweeps are not performed on subnets larger than /22.
The Ping Sweep Frequency can be configured in the Advanced Grid Discovery Properties and affects both the Smart Ping Sweep and Complete Ping Sweep features.
