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- ICMP as described in ICMP.
- NetBIOS as described in NetBIOS.
- TCP as described in TCP.
- Full as described in Full6.
These methods actively scan predefined networks and probe IP addresses. The Grid member listens for responses from the IP addresses as proof of activities. The IP discovery scans through the specified network ranges and probes IP addresses (except for the network, broadcast, and multicast address types) in each network, including the /31 and
/32 subnets. Note that the possible addresses in the /31 and /32 subnets can be used only as source addresses for point-to-point links. In these cases, there are no broadcast or network addresses in the /31 and /32 subnets, and the appliance can discover source addresses in these subnets.
644NIOS Administrator Guide (Rev. A)NIOS 8.1
About Discovery
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To use the ICMP discovery method, the ICMP protocol between the Grid member performing the discovery and the target networks must be unfiltered.
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To use the NetBIOS discovery method, ports 137 (UDP/TCP) and 139 (UDP/TCP) between the Grid member performing the discovery and the target networks must be unfiltered.
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To use the TCP discovery method, the TCP port and a specific set of ports between the Grid member and the discovered networks must be unfiltered. The default set of ports is defined by the factory settings.
NIOS 8.1NIOS Administrator Guide (Rev. A)645
IP Discovery and vDiscovery
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To use the full discovery, all the filter and firewall requirements in the ICMP, NetBIOS, and TCP discovery methods apply.
The following is a summary of the supported IP discovery methods:
Discovery Type | Returned Data | Guideline | Mechanism |
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ICMP |
| Use ICMP for a rough and fast discovery | ICMP echo request and reply |
NetBIOS |
| Use NetBIOS for discovering Microsoft networks or | NetBIOS query and reply |
TCP |
| Use TCP for an accurate but slow discovery | TCP SYN packet and SYN ACK packet |
Full |
| Use Full for a general and comprehensive discovery | 1. ICMP echo request and reply |
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2. NetBIOS query and reply 3. TCP SYN packet and SYN ACK packet |
The method you select to run an IP discovery determines the kind of information the discovery returns and the time it takes to complete an IP discovery. If time is a concern, the following are factors you may consider when configuring an IP discovery:
- The timeout value
- The number of attempts
- The number of ports the discovery scans
- The size of network you want to discover
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