Try playing with the timing. You may be overloading the AP, and a slower scan (e.g. using the "stealth" setting) may alleviate that.
Internet connection drops during NMAP scans
Well yes as the title suggests I have the problem of my internet connection dropping when I initiate nmap scans on BT3 (USB) and I have no idea what could be causing it.
I am using wireless and understand that from time to time it's normal to drop off but I am almost certain it's actually Nmap causing these drop offs because it happens exactly when the scan starts, any ideas what the problem might be and how I could fix it?
Try playing with the timing. You may be overloading the AP, and a slower scan (e.g. using the "stealth" setting) may alleviate that.
Thorn
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Okay I will try that, I think you might be onto something there because it sounds like it might be overloading of the AP because it doesn't happen with single scans really, only when I scan a few or a ranges.
The number of ports being scanned may also be an issue. Keeping with popular, known ports may also help, instead of scanning a huge range (like all 65000.)Originally Posted by MrFixer
Thorn
Stop the TSA now! Boycott the airlines.
One thing to remember if you're into or going into this work professionally is there are a lot of devices out there that will completely fall over if you do a full high speed port scan against them. So you need to be careful if you're doing these kinds of things where you might potentially cause damage by a device failing due to a port scan.
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Okay well the problem is definitely arising from initiating Nmap but it's not just when I do a scan, after the first scan my Internet will drop on and off constantly and it doesn't seem to matter what type of scan it is because I have tried many types now and also limited the number of ports being probed.
It's really weird perhaps someone has some other pointers on what this might be or had this problem, let me know plz!
Wireless assistant also seems to crash with an error reporting a software issue or possible bug? don't know what this could be.
If single scans seem ok, you may have to stick to that. Or start with one port and slowly add one more at a time and see when the connection starts dropping. Then keep it under that threshold. There might not be anything wrong per-say, some APs just can't handle scanning well. So you need to adjust your methods to suit. Have you tried scanning while plugged in via cable ?. It would help to know what AP you are dealing with.
A common cause of this type of problem when port scanning is the NAT table on your router filling up. Of course this usually only applies when you are scanning a system that's on the other side of the NAT translation.
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Hmm problem was solved when I installed BT4, I don't really know what was wrong to be honest but definitely seems like a bug or incompatability issue in BT3 rather than a type of overloading issue etc...
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