Is there a way we can throttle a scan based on the network bandwidth? For e.g. throttling a scan upto 1Mb? How can we approximate our Option profile to replicate this.
Yes you can do this. If you look under Option Profile, under the scan options then you should see performance. Here are the details. Now a little explanation and your TAM should be able to get you much more information.
Enable parallel scaling for Scanners; i.e. basically this is network slicing. If you have this turned on and you kick of a scan of say a /16 network then Qualys could decide to split i.e. slice the scan up among scanners. One scanner would own the scan and the others would take on parts of the scan.
Next you have hosts PER scanner to do in parallel. If you want the scan very slow you could reduce that to 1; think of each scanner now doing a /24 scan and testing one host at a time; takes a very long time. The others are similar. You can also reduce the number of vulnerabilities and targets will reduce the number of packets.
The last one you might want to review is the port scanning and host discovery option.
I think your best bet is to get a ticket with your TAM and get someone from Qualys to come up with the best option. You will need to do this in conjunction with monitoring your network. You might look at QOS settings in your network and you could assign a lower priority on the network if needed.
Good luck; David
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