Network monitoring

[Vinjamur K Vijay]

Hi,

I have a requirement like this

1: To capture any new device added to the network and find its details
for example if a new printer is added to the network (Irrespective of SNMP enabled)

2:Can I send any instruction to the device if so how..?

Can anybody suggest an open source application which can do this/ or where I find information regarding this.

Thanks for any little information in advance