Passive Asset Discovery Tool Recommendation?

[tim2]

Does anyone have a recommendation for a passive asset discovery tool/appliance? 

[HTCPCP-TEA]

I've used AlienVault's USM with some success previously. 

There are some Open Source tools that are pretty handy, but I won;t suggest any as I'm unsure of current versions and their stability. 

It largely depends on what is in your infrastructure, but I won't ask you to disclose that on a public forum.

Cheers

[Symesgc]

You should look at Forescout. They have agent less technology that is market leading.

[Caute_cautim]

If you are already obtaining Vulnerability Management Services via Qualys, they do Asset Management and discovery:  https://www.qualys.com/asset-discovery/

You may find this comes free with the existing service.

Regards

Caute_cautim