Getting DHCP BAD_ADDRESS on Windows DHCP
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Since unplugging the AP we haven't had any pop up again. Either a bad AP or bad client of the AP.
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@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
Base problem now.... whatever device this is keeps trying to connect and fills up the DHCP range quickly causing issues.
That's sounds like a DHCP starvation attack!
It ends up being that way, but we don't think it is intentional.
But what could possibly make the mac address change for each request?
The MAC address is gibberish, so our guess is a broken device (either end point or AP.)
How fast are the requests showing up? Maybe that would determine if it's malicious or not?
Very fast. Maybe every 10 seconds.
Maybe you can find it by working with the switches. First finding from which switch it comes and then from what port.
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@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
Base problem now.... whatever device this is keeps trying to connect and fills up the DHCP range quickly causing issues.
That's sounds like a DHCP starvation attack!
It ends up being that way, but we don't think it is intentional.
But what could possibly make the mac address change for each request?
The MAC address is gibberish, so our guess is a broken device (either end point or AP.)
How fast are the requests showing up? Maybe that would determine if it's malicious or not?
Very fast. Maybe every 10 seconds.
Maybe you can find it by working with the switches. First finding from which switch it comes and then from what port.
Weve isolated to one AP.
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@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@pete-s said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
Base problem now.... whatever device this is keeps trying to connect and fills up the DHCP range quickly causing issues.
That's sounds like a DHCP starvation attack!
It ends up being that way, but we don't think it is intentional.
But what could possibly make the mac address change for each request?
The MAC address is gibberish, so our guess is a broken device (either end point or AP.)
How fast are the requests showing up? Maybe that would determine if it's malicious or not?
Very fast. Maybe every 10 seconds.
Maybe you can find it by working with the switches. First finding from which switch it comes and then from what port.
Weve isolated to one AP.
Ahh, well I don't know what to do then.
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@pete-s We are going to change the PW on the AP so no clients can connect. It could be the AP itself. Then we gradually bring clients back on to see which one is the problem.
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@ccwtech That makes sense. Should be interesting to know what it was!
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@pete-s For sure!
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@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
Base problem now.... whatever device this is keeps trying to connect and fills up the DHCP range quickly causing issues.
I seen this issue before. It was a device that had a virus on it that was doing it.
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@obsolesce said in Getting DHCP BAD_ADDRESS on Windows DHCP:
@scottalanmiller said in Getting DHCP BAD_ADDRESS on Windows DHCP:
Base problem now.... whatever device this is keeps trying to connect and fills up the DHCP range quickly causing issues.
I seen this issue before. It was a device that had a virus on it that was doing it.
A possibility for sure. We are working to isolate it now.
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So what we are pretty sure we have narrowed it down to is a WiFi device that reports the temperature of the refrigerator to an online portal that sends out notifications when there is an out of range event.
There is an inside the fridge sensor and that sends the information to a receiver outside the fridge. The receiver part is what has the WiFi built in. I think the inside sensor to outside receiver communicate using 900 Mhz.
Who would have thought to check the refrigerator?
