The ARP table is where the responses to previous ARP requests are cached. IPAM utilizes a feature called Neighbor Scanning as an additional method of retrieving information. Neighbor Scanning pulls information from the ARP table of neighboring devices when ICMP and SNMP is blocked or disabled.
IPAM first checks if the device is capable of SNMP and supports ARP table:
To check whether SNMP is available, use the following OID:
- OidSysContact "18.104.22.168.22.214.171.124.0" iso.org.dod.internet.mgmt.mib-2.system.sysContact.0
To check whether the ARP table is available, use the following OID:
- OidIPNetToMediaTable "126.96.36.199.188.8.131.52" iso.org.dod.internet.mgmt.mib-2.ip.ipNetToMediaTable
The IPNetToMediaTable is pulled for client information. If the device supports this table, then IPAM can work with it.