Genericore-snmp_users is a project mainly written in PYTHON and SHELL, it's free.
generates informations from snmp server
asks an snmp-router for its arp-list and tries to verify this list via ARPING. The snmping is done via snmp-net and command line parsing, the arping uses 'scapy'.
This script needs superuser rights and otherwise will just skip the verification
snmpwalk -c shammunity 10.42.0.1 1.3.6.1.2.1.3.1.1.2