How much bandwidth is required to scan 1 class C subnet?

 
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Hi we are working with Open-AudIT and have in excess of 300 class C subnets to scan for devices, what sort of bandwidth is required and how long does this take?  We are really only looking for NW devices using ICMP and SNMP at this stage.

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      For network gear (switches, routers, printers, et al) bandwidth requirements are very minimal. I cannot provide exact measurements (kilobytes) as it depends on the device being discovered. For example a Cisco Nexus device will produce a lot more information than a HP Laserjet Printer. These devices are typically discovered using SNMP, hence multiple SNMP queries per device. Some of these (like listing the network cards) can affect the amount of data transmitted / received.

       

      For computers that perform a full audit script output, the data size will be between 60kB and 300kB. Computer audits are performed locally on the target device using a script. The output of that script is XML and uploaded to the Open-AudIT server once complete. The bulk of the retrieved information is the installed software data, so how much software is installed will directly impact the size of the data. 60kB was for a minimal install of a Debian server. 300kB was for a Windows machine with quite a bit of software installed. I would expect (typically) somewhere between 200 and 250 kB per discovered computer.
       
      Time to scan a class C (again) depends on the devices in that network. The more devices, longer to scan. The "larger" the devices, the longer to scan. The type of devices will affect the time to scan. "It depends" isn't the best answer, but it is actually quite true.
       
      Some anecdotal information. We have a client scanning 30,000 devices every 24 hours using a single Open-AudIT instance and multiple scheduled discovery runs occurring simultaneously. They have around 900 networks.
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