NU-Nomad is a network mapping program designed to automatically discover a local network, using SNMP to identify network devices and work out how they are physically connected together. The network is then presented as a topology diagram.
You can download it from the following link: https://packetstormsecurity.com/files/download/17010/nomad-0.1.5.tar.gz
Source: https://packetstormsecurity.com/files/17010/nomad-0.1.5.tar.gz.html